Hello, Well, I finally installed the filter caps on my Cam 88. The hum is gone - except if I squelch the radio? I did some voltage checking. It looks like...
Hmm shorted resistors are not common. I do in fact have one though I took out of an Oscope when it went bad. THought it was neat enought to keep. Greg...
... Yeah I know, a shorted resistor sounds weird! With no voltage drop and 0 ohms resistance, doesn't it look like a short? Unless I did something real...
Oh sorry no I don't have what you need what I have is a shorted resistor that I kept since they are not easily come by :) ... Yeah I know, a shorted resistor...
... resistor that I kept since they are not easily come by :) ... drop ... did ... resistor ... Resistors do not short out. They "open" or increase in...
Hence the reason I said it's not common. I heard it was a never saw it until I had to fix an old scope one time. Turned out to be a shorted resistor. I still...
... OK....maybe I am doing something stupid? I'm using a Simpson 260 to do my testing. As I stated earlier, there is no voltage drop across this resistor, and...
Hi Greg I'm sure you already know this but be sure to: 1. Disconnect one lead of the resistor before measuring it. 2. Put the Simpson meter on the scale such...
... to ... across ... Doesn't ... Well, that sure has to be a rare occurrence. All the bad resistors I've seen usually heat up, turn dark brown, change in...
... All right...I did something a bit stupid...DA...I won't go there! The resistor in question is OK. I still have one problem though. As I mentioned before,...
It's hard to tell what the standby switch disables unless you look at the schematic for your radio. Normally the standby switch disables the high voltage to...
The 'standby' position on the Cam 88 disconnects the B+ voltage leaving only the tube filaments on and ready for instant-on operation. So it would make sense...
... All of the electrolytics have now been changed, and the hum is still there. The hum disappeared when I pulled the 2nd IF amp tube. I have a Sam's guide,...
... Hi Dave, I swapped them last night and still had the hum. I should have posted that too. Thanks for the suggestion. 73, Grg ... checked ... learning! ......
Seems I found your radio in SAMS CB book 9. Please describe the hum. Is it a low level 60 cycle hum or one higher in frequency? I noted on the schematic that...
... The hum is 60 cycles. I'm going to go over my connections at the power supply again. As you stated, it seems like the 255 volts is not being properly...
I hate to advertise a business on this message board, but a while back I posted some messages on the board about pal vfos, and I came to find out that I needed...
A tube that has an internal short between heater and cathode WILL cause a hum in your audio. Not the most common way for a tube to fail, but it happens. Does...
... Well...I'm back, and I've found three problems! First, I had the stinkin' power supply wired wrong! And during all of the wiring and re-wiring, I...
... It's a beautiful thing! I replaced the power resistor and wired the supply correctly. It works! Now it's time to "pretty" everything up, align this...
Congratulations a Job well done! ... the ... of ... the ... WILL ... to ... help ... If ... like ... Dave" ... is ... on ... the ... well ... That's...
... Ya know RogerDoger, if it wasn't for you and everyone else on this forum, this radio may be in the salvage pile! I've spent this evening listening to...
