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President Washington d858


OldTech03

Sr. Member
Dec 15, 2017
697
1,226
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Well, let's see you could start at the pre-driver and make sure you have 27megs being delivered to the base of the pre-driver transistor. If not then you should check the transmit mixer stage and make sure your oscillator frequencies are present if they are but you have no 27 megs at the FET mixer just after L36 then obviously you have issues with the mixer stage could be a bad L36 could be a bad FET.

Or you could just go right to the driver transistor and avoid all that other stuff because it could be a bad driver.

It could even be there is no voltage being delivered to the collectors which brings up the question is it developing any power on SSB?
because if it is then it could be the regulator transistor of AM power.

I'm tired we are going to bed???
 

kaos513

Sr. Member
Apr 10, 2014
2,380
714
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Putnam county,NY
Well, let's see you could start at the pre-driver and make sure you have 27megs being delivered to the base of the pre-driver transistor. If not then you should check the transmit mixer stage and make sure your oscillator frequencies are present if they are but you have no 27 megs at the FET mixer just after L36 then obviously you have issues with the mixer stage could be a bad L36 could be a bad FET.

Or you could just go right to the driver transistor and avoid all that other stuff because it could be a bad driver.

It could even be there is no voltage being delivered to the collectors which brings up the question is it developing any power on SSB?
because if it is then it could be the regulator transistor of AM power.

I'm tired we are going to bed???
I ordered L35 & L36 from Ken electronics and I installed them last week.
 

Handy Andy

Do Your Research First, Then Decide...
Apr 23, 2018
5,242
7,190
573
www.cbtricks.com
Well, when running a hot little motor - need a set of gauges to keep an eye on the supply...

Tx light does work

How the voltages at the Mixer?

The Pin-out voltages - are they too high or too low? In TX mode?

My power supply is saying it’s pushing out 36 watts on am

So far so good. On frequency right?

The rest presumes it's been recapped and the "New Radio Smell" scenty has been replaced with a Fresh Pine dongle...
upload_2021-8-10_7-18-19.png
KEEP YOUR EYES ON THE ROAD!
Pay Attention!

Getting 8V on the TX rail at the Pre-Driver on down to the Driver and Final? (AM side seems to prove this so proceed)

36 "watts" means it's gobbling up about 2 to 3 amps to make the TX side work, but no 27MHz...

You are looking for Mods that may have been there, now removed - properly? Radio seems to operate just no power... Mods can upset the apple cart here - Fix it - if it ain't right.

AM Regulator sending power to the test points?

Can you get 12V to them in SSB modes?

Check, and if needed, before it blows up - check the output network - make sure you didn't buy a radio struck by a power line or lightning strike frying out the LPF and 50 ohm section back there.
 

midnight special

Sr. Member
Mar 13, 2012
910
622
103
64
my first gen washington did this once,, it was the little blue cap close to finals, it seems the fix was just remove this cap,, my washington still moving on,,, if we still had cb tricks forums there is a post about me fixing this problem,,,,, but alas some one killed the cb tricks forums,,,,
 

kaos513

Sr. Member
Apr 10, 2014
2,380
714
123
42
Putnam county,NY
Well, let's see you could start at the pre-driver and make sure you have 27megs being delivered to the base of the pre-driver transistor. If not then you should check the transmit mixer stage and make sure your oscillator frequencies are present if they are but you have no 27 megs at the FET mixer just after L36 then obviously you have issues with the mixer stage could be a bad L36 could be a bad FET.

Or you could just go right to the driver transistor and avoid all that other stuff because it could be a bad driver.

It could even be there is no voltage being delivered to the collectors which brings up the question is it developing any power on SSB?
because if it is then it could be the regulator transistor of AM power.

I'm tired we are going to bed???
Will check when I get home thanks I’ll report back
 

dxChat
Help Users
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  • @ ButtFuzz:
    on the connector with the green wire, if you short that to a nearby black wire, the power supply will turn on. (for use as a bench supply or whatever)
  • @ ButtFuzz:
    And IIRC, the purple wire is -12VDC, but that is from memory and it does not serve.
  • @ ButtFuzz:
    So if you need, say, 7v, connect + to the Yellow wire and - to the Red wire.
  • @ ButtFuzz:
    or or you need 9v connect + to the yellow wire and - to the orange wire. note: not all PSU's have the orange wire nowadays, as many manufactures had the voltage regulation on the motherboard, and all the power supply gives is 12 vdc
  • @ BJ radionut:
    Thanks ROB will check it out!~!! got to clean the work bench a little make room for that big case :)