If you are in the same, then you don’t]. SP6JLW: Andy sp6jlwXXwp.pl reports that his group did very well in the EME contest – We operated in multi Operator class on CW only. We have made 41 QSOs on 70 cm and 84 on 23 cm band, which is better than last year. On 70 cm we used 8 x 32 el BV yagis, GS35B PA, ATF54143 LNA and a TS811.
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  • Cooling fan for the main transformer. 12V - 0.2A DC. 6. FAN 2 Cooling fan for the power valves. 12 - 18V/ 0.3A DC, or 230V AC 18W. 7. PTT Connection to sequencer PTT input. Low voltage, low current entry. Fit for open collector control as well. For proper use connect it to foot-switch or on case digi modes to the computer serial port PTT Output.
  • Turning an MLA-2500B into a GS-35B HF RF Deck by WB8WJU The remote Power supply is 0-5000 VDC @ 2 AMP, CCS. Running at 3500VDC no load, it pulls down to 300VDC under full load. Plate current is 600-700 mA and grid current runs about 200 mA with 100 watts drive. Idle grid current is 100 mA with a single 50 volt, 50 watt zener for bias.
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  • The power supply for this amplifier must be capable of delivering 2800 volts DC, at 2 amps, key down. Due to the potential size and heft of the transformer and associated filter components, it is recommended that no attempt be made to incorporate it with the amplifier in a single chassis.
  • At each feedthru capacitor to transformer secondary junction, a wire is soldered which leads to a corresponding test point which is also thru-mounted to the front of the RF deck. The test points allow me to use my Fluke voltmeter to accurately measure filament voltage, which for a GS35b must be between 11.9 to 13.3 vAC (12.6V nominal).
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Nds bootstrapHeavy duty UK made 2.2kVA toroidal transformer with a high power voltage doubler HT board. Fully specified control and protection circuit board offering anode flashover protection, grid overdrive trip, auto soft start and in-built 3 minute warm-up timer. The cooling is via an integral high performance centrifugal fan. Cooling fan for the main transformer. 12V - 0.2A DC. 6. FAN 2 Cooling fan for the power valves. 12 - 18V/ 0.3A DC, or 230V AC 18W. 7. PTT Connection to sequencer PTT input. Low voltage, low current entry. Fit for open collector control as well. For proper use connect it to foot-switch or on case digi modes to the computer serial port PTT Output.

  • 1kV, 90 - 120mA depending on whether copper plate or graphite, 7K plate load.. Class A1 operation only, the driver is too wimpy to provide any significant grid current. (90 - 100W copper, 110W graphite typically) Fixed bias is employed and the driver is a triode connected D3A into a 5K 1:1 amorphous core interstage transformer.
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There are several 3CX3000A7s in use on 144 MHz in EU and they are all different. They range from 1/2wl striplines or 1/2wl tube over the anode like the RX1AS GS35B design to a clone of the W6PO but with a PTFE sandwich on top of the anode line instead of CRL blocking caps.
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Without driving power the PLATE meter indicates the base current of the PA. 5. OPR LED Glows when the PA is ready for transmission. During heating up period, when the LED doesn’t lit, the driving is blocked. The stby time is about 120 sec. 6. WAIT LED Blinking during the heating up period, indicating that the heating is in progress.
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I had hoped to simply bolt the modified frame onto the existing titanium plate, however, the original bolts are 1″ UNF and impossible to find as this is a non-standard bolt size. I have had to remove the original captive nuts and will replace the bolts with more standard metric sizes. Here’s the rear engine mounting plate.
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Soviet radar tube GI14b was produced since mid of 50-ties till mid of 70-ties and later replaced by GI39b tube, which has almost the same performance. Compare well known GS31b, resp, GS35b tube these radar tubes have lower plate dissipation, only about 500W and much average shorter life time.
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The triode is a single GS-31B and the plate transformer is a custom 80lbs 5KVA unit which will eventually be enclosed in a separate cabinet under the desk. Depending on which primary tap I use I can apply anywhere from 3600 to 4300 volts @ 1.5 amps continuous on the plate.
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The triode is a single GS-31B and the plate transformer is a custom 80lbs 5KVA unit which will eventually be enclosed in a separate cabinet under the desk. Depending on which primary tap I use I can apply anywhere from 3600 to 4300 volts @ 1.5 amps continuous on the plate. The HT voltage from the transformers was too high and so I bought a torodial HT transformer from Linear Amp UK. This was the most expensive component in the amplifier. Despite a lot of work I was unable to resonate the plate line.
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There are several 3CX3000A7s in use on 144 MHz in EU and they are all different. They range from 1/2wl striplines or 1/2wl tube over the anode like the RX1AS GS35B design to a clone of the W6PO but with a PTFE sandwich on top of the anode line instead of CRL blocking caps. Building Your Own Tube Amp. Ambitious title, eh ? Well the intent of this article is to lay out a logical plan of action for those courageous individuals who are contemplating building their own tube amplifier, but just can’t seem to figure out where to start. http://www.allelectronics.com/ MISC PARTS http://www.alliedelec.com/catalog/indices/indices.asp MISC PARTS: http://www.alltronics.com/ MISC PARTS http://www ... Our high performance UK manufactured toroidal transformer is bolted straight to the chassis using a strengthened support to allow transportation without risk of damage. The Challenger uses a single Russian GS35B triode. An 8877 can be specified as an extra cost option if required.
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Plate and filament iron is expensive unless you stumble across a good deal. The 3-500z is a nice tube but you will need a pair for 1500 pep and again I would shoot for 4kv on the plate. Unless you're strictly a ssb guy use forced air cooling with chimneys. The Russian GS35B is still cheap for the power it makes. Radio Amp Sale. Radio Amp quality assurance and price concessions. Find great deals for Radio Amp on eBay.

Mar 10, 2007 · Adding a variac to the plate transformer input; Mount and adjust W4ZT Bias Board; I purchased the RF Deck from Hillar N6HR, who then threw in the power supply for free. The GS35b Socket fit just fine in the 3-1000z hole. Schematic (click on it to get a bigger one) Freertos download for windowsTragedia alcala 20 madridP2119 infinitiMaineflashes maine coonsCounter blox script pastebin 2019This is due to a neon sign transformer's center tap on the secondary windings of the transformer. The mid point of the secondary is grounded so that the transformer will supply the rated voltage at the two outputs as a differential(one is +- 1/2Vs, other is -+1/2Vs). Meen rashi 2020 horoscopeGS35B Parts List A1 0-2 AMP PLATE METER A2 0-500 MA GRID METER C1 25-700 pf VACUUM VARIABLE CAPACITOR C2 10-1200 pf VACUUM VARIABLE CAPACITOR C3, C5, C7, C9, C13, C15, C20, C27, C28, C39, .01 µf 1kv disk ceramic capacitor

1kV, 90 - 120mA depending on whether copper plate or graphite, 7K plate load.. Class A1 operation only, the driver is too wimpy to provide any significant grid current. (90 - 100W copper, 110W graphite typically) Fixed bias is employed and the driver is a triode connected D3A into a 5K 1:1 amorphous core interstage transformer. Running this off of some Navy surplus 6200 VCT plate transformers, in a home brew linear. It works a treat, and did not break the bank. $300 for the tube and the socket. Air cooling supplied by a squirrel cage blower, and a Dwyer Photohelic manometer monitoring device. It will put out the legal limit easily.

The GS35B(GS-35B) tubes is used for wideband power amplification at frequencies up to 1000 MHz in RF equipment. We sale of brand new GS35B 2,5kW tubes at the best price in the World. Cooling fan for the main transformer. 12V - 0.2A DC. 6. FAN 2 Cooling fan for the power valves. 12 - 18V/ 0.3A DC, or 230V AC 18W. 7. PTT Connection to sequencer PTT input. Low voltage, low current entry. Fit for open collector control as well. For proper use connect it to foot-switch or on case digi modes to the computer serial port PTT Output. For the plate (TUNE) , I use a "surplus" micrometric recovery screw. Any other system can be retained provided it has good mass continuity. For example, the threaded rod alone through a nut should be avoided. At the end of the micrometric screw is a brass disc of 100mm diameter and a thickness of about 10/10 to 15/10 depending on your availability. MOTOROLA (4 à 5 in/Lbs appliqué sur une rondelle plate) ainsi Un circuit de polarisation du transistor MOS-FET est utilisé que les cotes de planéité pour le contact transistor / radia- autour d’un circuit intégré bien connu, un 1723. teur.]

Plate and filament iron is expensive unless you stumble across a good deal. The 3-500z is a nice tube but you will need a pair for 1500 pep and again I would shoot for 4kv on the plate. Unless you're strictly a ssb guy use forced air cooling with chimneys. The Russian GS35B is still cheap for the power it makes.


4400 volt transformer (rt) I have not seen any currently produced Amplifiers for amateur radio that use a Choke input HV filter and oil filled capacitor but HENRY! The clean RF deck Notice the lack of jammed in parts. Henry makes the roller inductor and plate choke in their LA facility: Showing input circuit. Yep, Henry makes all that too. Haskell for macThe transformer delivers 900 volts at 0.8 ampere ICAS, which I calculate will be enough to drive the amplifier to 1 kw in SSB service. With a voltage doubler the DC ouput will be around 2500 volts. The transformer was ordered from a factory in Czech Republic. The plate capacitor measures 22-320 pF and is also specially made for this project. Cooling fan for the main transformer. 12V - 0.2A DC. 6. FAN 2 Cooling fan for the power valves. 12 - 18V/ 0.3A DC, or 230V AC 18W. 7. PTT Connection to sequencer PTT input. Low voltage, low current entry. Fit for open collector control as well. For proper use connect it to foot-switch or on case digi modes to the computer serial port PTT Output.

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Plate transformer : I suggest "Hypersil®" type, but standard iron core is OK, <As of Dec. 31, 2007, P.W. Dahl Co. is no longer in operation. Harbach electronics has purchased the entire operation and now sells a more limited line of transformers.> These are not cheap, however they are the finest available, and I have never had a problem with them. If you are in the same, then you don’t]. SP6JLW: Andy sp6jlwXXwp.pl reports that his group did very well in the EME contest – We operated in multi Operator class on CW only. We have made 41 QSOs on 70 cm and 84 on 23 cm band, which is better than last year. On 70 cm we used 8 x 32 el BV yagis, GS35B PA, ATF54143 LNA and a TS811.

The GS35B(GS-35B) tubes is used for wideband power amplification at frequencies up to 1000 MHz in RF equipment. We sale of brand new GS35B 2,5kW tubes at the best price in the World. It's been a few days back, I didn't go back to find the post but someone wanted to know the formula for finding the plate impedance on a tube. For whomever it was, as I didn't see it ever get answered, I'll post it below. I almost overlooked it myself and forgot about it. RP = EP / 1.8 X IP Is skipping rope good for uterusParts for the GS-35B Triode HF Linear Amp Project ... Plate transformer Need ABOUT 2400-3300 VAC at 1 Amp or more. Bigger if you like more smoke. $350. Now this could ... The cabinet consists of the front and rear panels and a floor plate I have made by Front Panel Express (FPE, www.frontpanelexpress.com); they have design software you can download for free, which allows you to design custom panels and order them through their system. Their CNC machining process does all the hole cutting and engraving of those ...

Thanks to everyone for the info. I have been offered the tube for the cost of post n pack from another ham in NZ, it was a station pull, and he tried it on 6M but it did not perform well, I would think it required too high a drive level to be efficient. Ciao Mimmo , ottimo lavoro , anch'io sono passato dalle gi7b alla gs31b e ora alla gs35b . Ti volevo chiedere dove hai trovato il trasformatore toroidale da 12.6 V per i filamenti ma ne occorrerebbe uno anche a me. Grazie Giuseppe iw4dqy Changed endingsOn top, the BeMicro SDK “usb key”, supporting the FPGA. The Hermes lite itself is the small green board located on the right of the BeMicro, followed by a simple output board (two transformers winded on binocular). On the lower side, a bandpass filter (tcheb) originally designed for the Softrock Mobo 6.3 project. .Added a choke for protection of the output relay, the auxiliary transformer and the plate with regulated power supply for g2. 5.2.04 Temperature test. 1250 W DC-dissipation for 5 minutes. The temperature of outgoining air was about 60 degrees centigrade (not very precise measuring), but it's OK for the sufficient cooling.

The cabinet consists of the front and rear panels and a floor plate I have made by Front Panel Express (FPE, www.frontpanelexpress.com); they have design software you can download for free, which allows you to design custom panels and order them through their system. Their CNC machining process does all the hole cutting and engraving of those ... Dec 25, 2011 · From the specification I have read the GS-31b tube will work better at a higher plate voltage. There are some that use 3KV. If you are not planning on running more than 1KW with the GS-31b then the transformer for the AL-80B would be a good choice. At higher power output levels this transformer is not quite up to the task.

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Sep 24, 2012 · To test the transformer under load connect the secondary to the mains and load the primary till you get the rated input current flowing in it. This will load the copper to the right power point ( but at a low voltage) and allow you to test the core and windings safely. The LEDs are powered off the 12-0-12v transformer taps with 2 diodes and no smoothing capacitor. ... a GS35b HF amplifier ... at exactly 90 degrees to the base plate ... Surplus Parts & Equipment : Dr Alex UR4LL has quite a few Russian electronics parts and some equipment for sale. The list is updated periodically, and some items have pictures (click on links for details and/or pictures of each item); (Email UR4LL for details). High Voltage Plate Transformer. High Voltage Plate Transformer are rectifier transformers that supply power to the plate of a high power tube, typically for furnace applications such as induction heating and RF heating. These high voltage transformers are well suited for decades of reliable performance. Learn More →