The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

Courtesy of Rick http://cbtricks.com/radios/rci/rci_2950/graphics/rci2950_mod_reg_sch.pdf NPC mod does wonders with the audio. You could also volt the finals (Assymetrical Mod). I have done these to my 2950 and no splatter or harmonics as viewed on an Spectrum Analyzer. My VCO has issues where I'll ...

I followed Speedracer6g's post http://www.radiomods.co.nz/forum/viewtopic.php?f=2&t=2056 and copied the 33HP's driver to final section with his being an 88 I had to add and change different things. This is what I did so far Change: TR56,TR44 and TR43 to IRF520 C175 330 to 390pf C171 to 1500pf L3...

Can the same parts be used from the 33hp for a 44V?

I got an older 257 Orange display model with dual 1969's. I have about .5-1 watt TX and broken up to no RX. Voltage Reg. SB778 has 13 volts . 7808 regulators give me 8 and 13volts. I get a chirping sound when I TX. I don't have any RX from a radio next to it.

I have no dimming . however I have noticed that the area on the middle of the radio near the voltage regulator gets real warm on the chassis. I made a homebrew rf probe but I can't get it to work right so really I'm shooting in the dark. I have a parts radio to pull from but not to many IC chips to ...

I bought the radio with issues. I had low TX , 1-2 watts AM. I swapped the AM regulator to an 2SB817, still same problem. I adjusted the PLL via L17 and voila I got 25-30 watts TX. 1 week later I noticed that when I turn the power on I get little RX then a minute or so later it would kick in and nor...

Rick,
Got it working, PLL was way out. I need to align the TX section again. Thanks

Sorry Rick, EPT295011Z , If the Audio IC is bad wouldn't I lose the audio through the PA

I bought the radio with no audio out just a 1/2 watt dk in AM , SSB has audio but with low swing of 1 watt to 3 watt swing. After adjusting VR14 I was able to get back some swing on the AM, 1/2 watt swing to 1 1/2 watts. I have no RX . I have a Fluke 77 but no RF probes so vlotages cannot be read fo...