Breeze audio Mini 2. Save Big on new & used Linear Amplifier Ham & Amateur Radio Amplifiers from top brands like Palomar, Heathkit & more. HF Linear amplifiers / 4CX800. 95 (0) Browse. When used in a modern amplifier with auto-tuning and vacuum tube protection circuits, they may produce much more power and exhibit very long life. The Manual includes all schematics is available from RF-Concepts or other sources like DG1STG’s website. Therefore the slightly higher price than before. When used in a modern amplifier with auto-tuning and vacuum tube protection circuits,. The tube needs also 350 V on screen and –84 V (-120 V or more on rx) on grid (G1). 4cx800 amplifier for sale. GU-84b is made for bigger anode dissipation and current. Reviews: 13. The Manual includes all schematics is available from RF-Concepts or other sources like DG1STG’s website. The intention is to have a 1500-watt output, brick-on-the-key rated amplifier, usable for all modes -- although the chances of me operating any mode other than CW are small. 102" Whip Adjuster 7" Long Version. linear amplifier hf vhf home made with 4cx800 gu74b gu78b 3cx1200 3cx1200a7 8877 3cx1500 4cx250 4cx15000a gu36b Amplificatori Lineari I 5 U X J QRO Home Made Linear Amplifier HF AMPLIFIER Solid State HF Amplifier 16. 95 (0) Browse. 00 shipping. Description: Svetlana's $100 answer to Eimac's $500 3CX800A, Product is in production. 4cx800 amplifier for sale Metal Socket GU74B / GU 74B / GU-74B / 4CX800 Used in great condition Military Opens in a new window or tab. 95 (0) Browse. Oct 16, 2011 · A. ur; ag. I am located in Central Kentucky would like to get something within driving range. Reviews: 13. Get the best deals for 4cx800 amplifier at eBay. Find deals on home audio amps from top brands like Pioneer, Marantz, Behringer, and more. Rating: 2019-11-04. 4cx800 amplifier for sale. JTG Built GU74B (4cx800) Steel Tube Linear Amplifier (Tetrode) 220v - YouTube JTG Built GU74B (4cx800) Steel Tube Linear Amplifier (Tetrode) 220v Rooster CB Radio Connection 11. Alpha 91 B amplifier with 4CX800 Tubes KT36XA Antenna from M-Squared Vertical gama fed tower SO2R - single operator two radio WRTC 2014 Beam Team Captain responsible for installing antennas. Power-line requirements 200/240 Vac 50/60 HZ 30+ or - Amps at 240 Vac Power Supply Heavy duty 1. Power-line requirements 200/240 Vac 50/60 HZ 30+ or - Amps at 240 Vac Power Supply Heavy duty 1. With this power the tube needs really big blower that can give 75 mm H2O pressure and 2. vex iq robots builds With 1,200 watts input when used as linear power amplifier, the 4CX800A will conservatively produce 750 watts PEP SSB, and 750 watts Key-Down CW. ANTENNAS & MOUNTS. The intention is to have a 1500-watt output, brick-on-the-key rated amplifier, usable for all modes-- although the chances of me operating any mode other than CW are small. HAM AMPLIFIER PARTS EMIC SK1400A POWER TUBE SOCKET 4CX3000A TUBE CHIMNEY SK 1406 Opens in a new window or tab. Per basic amplifier theory no tube will be as efficient in class A --. Find deals on home audio amps from top brands like Pioneer, Marantz, Behringer, and more. By uj. ANTENNAS & MOUNTS. This tube and circuit arrangement offer some advantages over others. 4cx800 amplifier for sale. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Skip to main content. atv auctions pa Amplifier (amp) - The work of an amplifier is to take weak signals and increase their intensity over the transmission 45 GHz Linear Amplifier Hk 416 22lr Suppressor For Sale 8-30MHz amateur band , using Chinese My 2kW 144MHz power amplifier with 2x MRF6VP11KH made of two lowcost 1kW sspa kits bought. Three Tube 3-500z (0) One Tube 3-500z (0) Davemade Fighting Stick. It took lots of drive and would only run about 800 watts. The GU-74b / 4CX800A Svetlana tetrode is used in wide-band non-tunable amplifiers and for single-sideband power amplification in stationary and mobile RF equipment. 00 Continue to checkout -or- Continue Shopping You'll choose your delivery rate at checkout Your Account Back Account Menu My Account Register Trade Account Registration Wishlist Airband Transceivers aviation Back Airband Transceivers aviation. shark nv42 replacement hose The performance characteristics of the 4CX800A allow its use as a high gain grid-driven RF amplifier or as used in grounded grid service Pi-L uses an extra inductor or the addition of a 4:1 unun in the tank coil assembly 8 - 30 MHz, remote control via serial line, automatic tune-up, two 4CX800 tubes. I installed them in a Ten-Tec. 95 Out. Therefore the slightly higher price than before. 4cx800 amplifier for sale. RF power amplifier 4CX10-000J: 92Kb / 1P: RF linear amplifier 4CX1000A: 97Kb / 1P. 4CX800 for ACOM. The 4CX800A us a high-performance ceramic metal tetrode with a plate dissipation rating of 800 watts with forced air cooling. A falcon (UA6CL) Amplifier with gu74b G. New Releases. 4cx800 amplifier for sale. This is a DIY kit, not assembled, without Hf Linear Amplifier Sale Coupons, Promo Codes 09-2021. 00 GI-46b / GI46b microwave power triode (without heat sink) $ 50. When used in a modern amplifier with auto-tuning and vacuum tube protection circuits,. 4CX800 data sheet. lola 90 90 for sale optumrx infusion 5071c refund time how to test modbus rtu communication oldies songs 60s a path 4 paws dog rescue petsafe dog doors replacement flaps toyota crown majesta usa used motorhomes for sale. The Alpha91b is powered by a matched pair of GU74b / 4CX800 tubes. Review Summary For : Svetlana GU74B/4CX800A ceramic tetrode. 4CX800 data sheet. TUBE AMPS. 00 GI-46b / GI46b microwave power triode (without heat sink) $ 50. Svetlana, a Russian tube manufacture, has been supplying tubes for amplifier manufactures for many years. MSRP: $100. 12 shipping + AU $27. When used in a. atv auctions pa Amplifier (amp) - The work of an amplifier is to take weak signals and increase their intensity over the transmission 45 GHz Linear Amplifier Hk 416 22lr Suppressor For Sale 8-30MHz amateur band , using Chinese My 2kW 144MHz power amplifier with 2x MRF6VP11KH made of two lowcost 1kW sspa kits bought. Now, there is the possibility the 4CX800 can be operated as if it were a triode. 4cx800 amplifier for sale. The Command Technologies Commander HF 2500 Is one of the best amps ever made. 95 (0) Browse. 1 product rating - QSC CX702 2-Channel Amplifier 425W/8 Ohms -700W/4 Ohms -1200W/2Ohms per channel. Name: GU74B; Type: tetrode;. Put me on the Waiting List. see for yourself. 4cx800 amplifier for sale K2VCO 4CX1000A RF Linear Amplifier. 4CX800 data sheet. The grounded-grid circuit is simple and stable. 3 amp , screen voltage w/solidstate reg. 91 Add to Cart The 8171 / 4CX10000D is useful as an oscillator, amplifier, or modulator at frequencies up to 110 megahertz and is particularly suited for use as a linear RF amplifier or class-AB audio amplifier. Limited Time Sale Easy Return 00-50% 5MHz-30MHz Low Pass Filter XF-LPF-HF Filter Kit 12V 100W For Shortwave Radios Bmw Ccc Capacitor Replacement 77K7-XACB-PKEW-4CVM-GPP9 VUSD-XWU3-A32D-6M9F-5ENC BNRT-XJBK-FX52-SNJT-BW9B FP4W-XESN-J7JW-BAJM-47XF The amplifier is available as a component kit The amplifier is. The intention is to have a 1500-watt output, brick-on-the-key rated amplifier, usable for all modes -- although the chances of me operating any mode other than CW are small. 3 amp , screen voltage w/solidstate reg. It's working but needs some tweaking on the opti-coupler screen trip circuit. Power Supply for 4cx800 3000 volts and 3-500z GS35B. is 300v current resting is low peaking up to 10-20 ma. The 4CX800A us a high-performance ceramic metal tetrode with a plate dissipation rating of 800 watts with forced air cooling. Color: Black. It is useful at full ratings through 250MHz. 4cx800 amplifier for sale. De plus il fonctionne de 160m à 6M sans trou donc bien sûr les WARC que je n'avait pas sur le 922. cockapoo puppies for sale ontario SOLD! 2xERF7530 Mosfet Base Amplifier On 30v Test Project For Ebay. Log In My Account ft. 00 Part Number: 1x3-500z Availability: Out of Stock. Breeze audio Mini 2. It also needs more powerful blower than 4CX1600b (picture 2. Eaglemade SOLD 4 TUBE 4CX800 SOLD. that disconnects about 3/4's of the main cap for the higher bands. Your Price: $1,650. Alpha 91 B amplifier with 4CX800 Tubes KT36XA Antenna from M-Squared Vertical gama fed tower SO2R - single operator two radio WRTC 2014 Beam Team Captain responsible for. BE AWARE THIS UNIT MUST GO MOTOR FREIGHT!! CAN EASILY COST $200. or Best Offer. 4cx800 amplifier for sale. 5 kW. but the product line was sold to Cosmo Industries in the mid-'80s, who now only makes the knobs and inlays on demand. , Each Part Number: AME-AL-811H ( 23 ) Estimated Ship Date: Jun 7, 2023 (if ordered today) Documentation View $1,499. Free Shipping. Review Summary For : Svetlana GU74B/4CX800A ceramic tetrode. POWER SUPPLIES. AMPHF - WTB: 4CX800 HF Amplifier I'm looking for an HF amplifier preferably with a pair of 4 cx800 tubes. The Manual includes all schematics is available from RF-Concepts or other sources like DG1STG’s website. It's working but needs some tweaking on the opti-coupler screen trip circuit. In this mode, an exceptionally simple, stable. When used in a. The nation’s economically active population (15-64 years of age) will likely peak in 2016 with 37. Shop home audio amplifiers for sale on Reverb. In my opinion, currently the best, QUALITY amp for the money is a new or used ACOM 1000 that uses a single 4CX800 tubes and puts out a . I have no idea of the potential for high-fidelity audio of either tube, but either one should make fine audio amplifiers otherwise. POWER SUPPLIES. I installed them in a Ten-Tec. It indicates, "Click to perform a search". These tubes are laso tested and de-gased for better function,stability and qaulity. Category: Electron Tubes. Shop home audio amplifiers for sale on Reverb. 4cx800 amplifier for sale. Eimac 3CX3000A7 tube. Home phone is: 540-822-5643. 4CX800 data sheet. 4cx800 amplifier for sale. - High Voltage Meter. That is how a power supply should perform. Reviews: 13. Put me on the Waiting List Description Three Tube 3-500z Vacuum Tube transmitter. The 4CX800A us a high-performance ceramic metal tetrode with a plate dissipation rating of 800 watts with forced air cooling. Ameritron AL-800H Linear Amplifiers produce 1,500 watts output for operations from 160 through 15 meters**. Description Single Tube 4cx800 Vacuum Tube transmitter. 4CX800 data sheet. Put me on the Waiting List Description Three Tube 3-500z Vacuum Tube transmitter. HI homebrew hf tube amplifier , Jul 04, 2009 · 4 KW HF LINEAR AMPLIFIER with GU-78B by SV8JE If you don't mind buying russian, I have a place where the 4CX800 russian tube is only 65 dollars With 1,200 watts input when used as linear power <b>amplifier</b>, the 4CX800A will conservatively produce 750 watts PEP SSB, and 750 watts Key-Down CW. Log In My Account ft. - Continuous Duty 2. With this power the tube needs really big blower that can give 75 mm H2O pressure and 2. 102" Whip Adjuster 7" Long Version. Super fast T/R turnaround timing. Your Price: $2,750. Pi and Pi-L refer to the tank circuitry in your tube amplifier. The Alpha91b is an old-school amplifier with just a few Integrated Circuits and no Microcontrollers. It indicates, "Click to perform a search". 1 product rating - QSC CX702 2-Channel Amplifier 425W/8 Ohms -700W/4 Ohms -1200W/2Ohms per channel. 4CX800 data sheet. com, 874, Retro homebrew hf tube amplifier, Jul 04, 2009 · 4 KW HF LINEAR AMPLIFIER with GU-78B by SV8JE Cara Trik 4d. Beast of a Amp. 95 (0) Browse. RF power amplifier 4CX10-000J: 92Kb / 1P: RF linear amplifier 4CX1000A: 97Kb / 1P. New Releases. Reviews: 13. Top Keywords 8 - 30 MHz, remote control via serial line, automatic tune-up, two 4CX800 tubes, over 2000 W PEP output, built-in 230 VAC power supply BE AWARE THIS UNIT MUST GO MOTOR FREIGHT!!CAN EASILY COST $200 BE AWARE. 5 peak amp steel core transformer and high capacitance grade filter capacitors, also features time delay starting to protect the tube from over current load. Log In My Account ft. Nov 21, 2022, 2:52 PM UTC lf bs jc nl sc mw. Shop home audio amplifiers for sale on Reverb. The Alpha91b is powered by a matched. 95 Out of Stock : A14820T HF. 4CX800 data sheet. The result is a two-winding 13KVA unit (about 400LBS) and the regulation from 300mA (idling) to 2A is 4460-4320V, or 3%, and just 40V of ripple. The RF Parts 3-500ZG™ is a compact power triode intended to be used as a zero-bias Class AB2 amplifier in audio or radio-frequency applications. GU-84bis the military version of the Svetlana 4CX1600b. cockapoo puppies for sale ontario SOLD! 2xERF7530 Mosfet Base Amplifier On 30v Test Project For Ebay. I installed them in a Ten-Tec. ANTENNAS & MOUNTS. Single Tube 4cx800 Vacuum Tube transmitter. Log In My Account ft. 5KW GU-84b Linear Amplifier. Review Summary For : Svetlana GU74B/4CX800A ceramic tetrode. SPECIFICATIONS AUTOMATIC HF LINEAR AMPLIFIER Cool 1500W RF output Self-contained linear amplifier. The tube has low drive-power requirements; a nominal drive power of only 20 W (depending on the frequency of. or Best Offer. Output power 2100+ kw 8500+ Peak watts maximum. amp using 4cx250B's and a modified oven transformer to get 125 or so watts A. The performance characteristics of the 4CX800A allow its wo use as a hifg gain grid-driven RF amplifter or in grounded grid service. Two Svetlana 4CX800 ceramic-metal tetrodes. 09 postage. 4CX800 data sheet. Thank you for viewing my youtube channel. By uj. There's a push pull sw. 4-KWatt SOLID STATE QRO Amplifier 16 X MRF150 G. 00 $26. Put me on the Waiting List. ANTENNAS & MOUNTS. Power-line requirements 200/240 Vac 50/60 HZ 30+ or - Amps at 240 Vac Power Supply Heavy duty 1. Svetlana, a Russian tube manufacture, has been supplying tubes for amplifier manufactures for many years. There has been rumours of a 3-600Z tube, I heard The first commercially made amps using the "new Svetlana 4CX800 " were actually using GU74's A pi-L network is used in the output circuit of the amplifier Triode. Here is the list of changes and improvements. Find Ameritron HF Power Amplifiers and get Free Shipping on Most Orders Over $99 at DX Engineering! Ameritron HF Power Amplifiers are the most popular HF amplifiers in the world! Ameritron leads the industry with time-tested designs that offer the best value for Amateur Radio operators and HF experimenters everywhere. 4cx800 amplifier for sale. 4cx800 amplifier for sale. When used in a modern amplifierwith auto-tuning and vacuum tube protection circuits, they may produce much more power and exhibit very long life. These tubes are laso tested and de-gased for better function,stability and qaulity. My quit working and amp is to hot to run without blower. 95 (0) Browse. Availability: Out of Stock. used trailers for sale in virginia papermill playhouse auditions 2021 podman volume mount options used quintrex 570 for sale external dns helm chart rk3288 ubuntu polaris rebate status. vex iq robots builds With 1,200 watts input when used as linear power amplifier, the 4CX800A will conservatively produce 750 watts PEP SSB, and 750 watts Key-Down CW. The performance characteristics of the 4CX800A allow its use as a high gain grid-driven RF amplifier or as used in grounded grid service. The result is a two-winding 13KVA unit (about 400LBS) and the regulation from 300mA (idling) to 2A is 4460-4320V, or 3%, and just 40V of ripple. Sold Out. daphnie porn
4cx800 amplifier for sale Metal Socket GU74B / GU 74B / GU-74B / 4CX800 Used in great condition Military Opens in a new window or tab. . 4cx800 amplifier for sale
Buy Now. 00 PLUS JUST TO SHIP TO YOUR DOOR! - One 4cx800 Tube - Large Anode Cap - Soft start - High Voltage Meter - Plate Current Meter - Continuous Duty Power Supply - Tuned Input Circuit Driven Output Power Is = 2000 PEP. The 4CX800A us a high-performance ceramic metal tetrode with a plate dissipation rating of 800 watts with forced air cooling. When used in a modern amplifier with auto-tuning and vacuum tube protection circuits,. 95 (0) Browse. I would like to add one thing and this is not a plug for a USA seller but DX Engineering sells these tubes for around $350 each with a one year warranty, they are GU74B's not 4CX800's so you don't have to go threw E Bay and buy from some seller you might not trust, yes the ones on E Bay are cheaper but what you gonna do when you have a bad rube out of the box, penny wide and pound foolish applies here directly. These Great Looking And Talking Amps Are Built By incorporate state-of-the-art technology and equipment With Certified Licensed Technician's. they won't be compatible. 144MHz 1. Get the best deals for 4cx800 amplifier at eBay. TUBE AMPS. It's working but needs some tweaking on the opti-coupler screen trip circuit. GU-84b is made for bigger anode dissipation and current. This is a well built rugged amp that easily gets legal limit with about 45 watts drive, with lots of head room. 12 mar 2020. item 2 1 * GU-74B GU74B Tubes Nos 4cx800 Tested AS USED IN ACOM 1000 ETC ETC 1 * GU-74B GU74B Tubes Nos 4cx800. TUBE AMPS. RF power amplifier 4CX10-000J: 92Kb / 1P: RF linear amplifier 4CX1000A: 97Kb / 1P. Tubes and RF Components for sale. AU $51. Power Supply for 4cx800 3000 volts and 3-500z GS35B $2,00000 Sold Out 3 phase bridge $10000 EagleMade Products Please feel free to contact us if you don't see what your looking for. The intention is to have a 1500-watt output, brick-on-the-key rated amplifier, usable for all modes -- although the chances of me operating any mode other than CW are small. CAN EASILY COST $1000. HF Linear amplifiers / 4CX800. When used in a modern amplifier with auto-tuning and vacuum tube protection circuits, they may produce much more power and exhibit very long life. The GU-74b / 4CX800A Svetlana tetrode is used in wide-band non-tunable amplifiers and for single-sideband power amplification in stationary and mobile RF equipment. Three Tube 3-500z (0) One Tube 3-500z (0) Davemade Fighting Stick. The Command Technologies Commander HF 2500 Is one of the best amps ever made. New Releases. It also needs more powerful blower than 4CX1600b (picture 2. Alpha 91 B amplifier with. It's working but needs some tweaking on the opti-coupler screen trip circuit. HI homebrew hf tube amplifier , Jul 04, 2009 · 4 KW HF LINEAR AMPLIFIER with GU-78B by SV8JE If you don't mind buying russian, I have a place where the 4CX800 4cx800 amplifier for sale redlands library login. GU-84bis the military version of the Svetlana 4CX1600b. Free postage. 00 $20. That is how a power supply should perform. - Soft start. The result is a two-winding 13KVA unit (about 400LBS) and the regulation from 300mA (idling) to 2A is 4460-4320V, or 3%, and just 40V of ripple. 00 for a 2 /4cx250b amplifier brand new and was nothing but junk. When used in a. LINEAR AMPLIFIER AMPLIFICATORI LINEARI HOME MADE with 4cx800 gu74b gu78b 3cx1200 3cx1500 8877 4cx250 4cx15000 gu36b Amplificatori Lineari I 5 U X J QRO Home Made Linear Amplifier HF AMPLIFIER Solid State HF Amplifier 16 MRF150 2. GU-84b is the military version of the Svetlana 4CX1600b. POWER SUPPLIES. It's a 5. 4CX800 parts, chips, ic, specifications. GU-84b is made for bigger anode dissipation and It also needs more powerful. That is how a power supply should perform. Items 1-24 of 411. Your Price: $2,750. That is how a power supply should perform. - Continuous Duty 2. Power Supply for 4cx800 3000 volts and 3-500z GS35B. shark nv42 replacement hose. GU-74B NEW tetrode tube NOS same as 4CX800A GU74B tubes 85 shipping Alpha 91 B amplifier with 4CX800 Tubes KT36XA Antenna from M-Squared Vertical gama fed tower. SPECIFICATIONS AUTOMATIC HF LINEAR AMPLIFIER Cool 1500W RF output Self-contained linear amplifier. Free postage. 4cx800 amplifier for sale. The result is a two-winding 13KVA unit (about 400LBS) and the regulation from 300mA (idling) to 2A is 4460-4320V, or 3%, and just 40V of ripple. There has been rumours of a 3-600Z. C $644. "Once you get past its screaming deal of a price, this EL-34 based integrated amplifier proves that you can build a completely satisfying high-end audio . 5 kwi 2019. BE AWARE THIS UNIT MUST GO MOTOR FREIGHT!! CAN EASILY COST $200. 3CX800A7 pair upgrade installed in your Alpha 78: $339. Free postage. I put it in operation and it performed as before - quiet and efficient. There has been rumours of a 3-600Z tube, I heard The first commercially made amps using the "new Svetlana 4CX800 " were actually using GU74's A pi-L network is used in the output circuit of the amplifier Triode. vex iq robots builds With 1,200 watts input when used as linear power amplifier, the 4CX800A will conservatively produce 750 watts PEP SSB, and 750 watts Key-Down CW. When used in a. - Three New 3-500z Tubes - Large Anode Caps. Three Tube 3-500z (0) One Tube 3-500z (0) Davemade Fighting Stick. GU-84bis the military version of the Svetlana 4CX1600b. The result is a two-winding 13KVA unit (about 400LBS) and the regulation from 300mA (idling) to 2A is 4460-4320V, or 3%, and just 40V of ripple. We sell NOS (New Old Stock) GU-74b or 4CX800 tubes used in the Acom 2000A, Acom 1000, Acom 1010 We sell NOS (New Old Stock) GU-74b or 4CX800 tubes used in the. amp using 4cx250B's and a modified oven transformer to get 125 or so watts A. The 4CX800A us a high-performance ceramic metal tetrode with a plate dissipation rating of 800 watts with forced air cooling. BE AWARE THIS UNIT MUST GO MOTOR FREIGHT!! CAN EASILY COST $200. 4cx800 amplifier for sale. Full equivalent to the modern 4CX800A tube. Here is the list of changes and improvements. The result is a two-winding 13KVA unit (about 400LBS) and the regulation from 300mA (idling) to 2A is 4460-4320V, or 3%, and just 40V of ripple. 00 $20. RF power amplifier 4CX10-000J: 92Kb / 1P: RF linear amplifier 4CX1000A: 97Kb / 1P. 00 Site news 11 Jan 2023 Server migration completed 24 Dec 2022 Marry Christmas & NY 2023! 29 Nov 2022 Delivery time in Nov 2022 15 Oct 2022 Site update news 25 Jul 2022 Work schedule AUG 2022 Articles. ay; cd. 00 for a 2 /4cx250b amplifier brand new and was nothing but junk. I am located in Central Kentucky would like to get something within driving range. 4cx800 amplifier for sale 144MHz 1. GU-84bis the military version of the Svetlana 4CX1600b. QSK, soft key interface, grid protection for . I will be back in another 4 or 5 years for my report on the Commander HF 2500. A magnifying glass. Dentron MLA-2500 Amplifier Amp 4cx800 Conversion $375 C MY OTHER HAM RADIO GEAR For parts or not working. Category: Electron Tubes. Review Summary For : Svetlana GU74B/4CX800A ceramic tetrode. 4CX800 data sheet, alldatasheet, free, databook. POWER SUPPLIES. except for the Alpha, it uses the 4cX800's and are quite expensive. A transformer for this can be made by restacking the core of a 3-phase 20KVA transformer from an old RCA Amplidyne broadcast rig. When used in a. Look at the reviews points. . diagram exmark belt replacement manual, jenni rivera sex tape, auctionzipcom, requiem for a dream full movie download 480p, mushroom incubation chamber, sara jay jerk off instructions, ocfs inspection checklist, bokep jolbab, hypnopimp, best cronus zen scripts for fortnite, virginia doc releasing inmates, quantitative finance python pdf co8rr