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Doing the 40yr/100k mile tune up. I see some resistors denoted as wire wound and some as metal oxide I'm assuming the rest are just regular metal film? Don't like to assume just double checking. Thanks Ira

Would like a little input on some upgrades to the bench. Frequency counter, I have doesn't read lower frequencies (455, 4.400, 6 mhz) not looking to break the bank I'm fine with older used units that have decent specs. Oscilloscope, my old Tenma 72-6820 has dropped 1 of the channels and giving...

Looking for some advice on the main board? The service manual shows ept695011a mine is a 2005 model with the ept695014b? I'm assuming the alignment is the same? The only mod I see is the limiter has 1 leg lifted. I would like to do a few more mods to it, 1st is adding a second final all the...

It's got a few problems! Initial inspection no driver tubes (6kv6a) x 2. 9 pin bases 1) grounded, 2) hv board thru choke to pin, 3) input tune , 4) heater volts, 5) heater ground, 6) open, 7) grounded, 8) grounded, 9) open, plate voltage rerouted to 100 ohm 3 turn parasitic up top with two plate...

This thing has had a full alignment works absolutely fantastic tx/rx spot on. But it does have one issue on ssb ? At full rf gain the audio has some distortion on it, back the rf gain down to six it clears right up spot on frequency. I've read some other post about this issue checked c43 10pf...

A friend got this thing for nothing 1x2x6 8950 tubes. So I cleaned it up best I could tested all the tubes bought Nomad radios hv supply board and the rest of the electrolytic caps, was going to put in the protection diodes on the cathode feed to the 2 drivers and the 6 finals and found a small...

A friend got this thing for nothing 1x2x6 8950 tubes. So I cleaned it up best I could tested all the tubes bought Nomad radios hv supply board and the rest of the electrolytic caps, was going to put in the protection diodes on the cathode feed to the 2 drivers and the 6 finals and found a small...

Here's what I have Pin 1 anode of d128 to top lug clarifier. Pin 2- 3 blue/white , Pin 3 violet to anode of d125, pin 4-X, Pin 5-3 red/white, Pin 6-2 orange/white, Pin 7 Blank, Pin 8-X, Pin 9 Blank, Pin 10 orange, Pin 11 yellow, Pin 12-X. Everything is seems to be wired correctly radio...

cobra 29xlr has receive, audio from pa, no tx output. Whats been done, aligned pll/vco per manual L5 peaked , 10.240 good stable, L20 3v stable, L21 peaked, L24 peaked at 37.878 (42-96) last 2 digits are oscillating? checked 36.570 at gate of tr18 spot on and stable, I think there should be 2...

cobra 29xlr has receive, audio from pa, no tx output. Whats been done, aligned pll/vco per manual L5 peaked , 10.240 good stable, L20 3v stable, L21 peaked, L24 peaked at 37.878 (42-96) last 2 digits are oscillating? checked 36.570 at gate of tr18 spot on and stable, I think there should be 2...

Have the schematic and the owners manual. Trouble shooting the s-meter circuit stays full scale unit on and setup (rf gain max avc on) antenna disconnected, adjust zero pot no change in meter still full scale. The voltage does drop on the top lug yellow wire from adjusting the zero pot. Should...

This ones gonna be a little winded so bear with me. EPT690010C Picked this up for next to nothing previous owner said he was running a palomar 300 amp, amp went kaboom his words next day got the amp out of line fired up the radio no tx had a bad storm that night doesn't know if the amp killed it...

I need a little information on this mod. Can this mod be preformed without the variable pot to set the dead key at say 2 watts? Maybe a fixed resistor value to set it and forget it kinda like the cobra 29 mod. It's a locales radio and needs to be sorta tamper proof. (nicest way I can say it)...

Can't find a service manual for this unit. Is there another radio that uses the same board p-200820 or KCMK-47X only numbers I could find on the board. Trouble shooting no receive audio!! What it has tx signal and audio (5kcs low) 3 watt swings to about 18 watt. Has receive signal on meter from...

Having issues with the 8 volt rail. It has the sa1869 regulator in it 2.4 volts on the collector when attached lift the leg it goes to 13 volts, removed it tested it on 2 different testers show good no leakage? I've tested components before that showed good when in fact they were faulty! If I...

Low Bias driver/finals 2166/2312 x2 No ALC vr#12 No low power adjustment vr#16 I'm trouble shooting these circuits I've came to tr#35, tr#39 (marked tr30 on board, just in front of transformer t1 one voltage labeled this a talk back tr, no talk back in the 2980?) and tr#48. I've been thru the...

RCI 2980 EPT360014B 3 problems Thread starter ira parker Start date Friday at 5:54 PM Tags None REPLY Unwatch I ira parker Member Friday at 5:54 PM Add bookmark #1 The short story, No tx got that resolved. Once tx was restored there is a 4-6 watt dead key on sideband ? Also only about...

The short story, No tx got that resolved. Once tx was restored there is a 4-6 watt dead key on sideband ? Also only about 10 watts output on ssb and vr#12 doesn't adjust it? AM works fine rx and tx, 22 watts out audio chain is good. Pll/vco took alignment just fine spot on frequency. Started Tx...

receive all modes just fine, pa section works as should. has weak signal to monitor radio all modes. checked freqs all is good. pre driver is good has proper volts and is switching. in am mode has 12.8 volts to final and driver in receive switching to tx voltage drops to -9 volts. unplugged...

I posted this in the yaesu mods section also. considering buying one of these, not much info on the tx mod. anyone done one of these? wonder if it's the same as the 2900 mod ?