Sold 7027A as EL34 equivalent. Amp not working now

[kvflyer]

.... As a guy once said, "Trust, but verify".

Ronald Regan, referring to the nuclear weapons between the US and Soviet Union comes to mind...

 

[thorpej]

Right, all you need to do is put in a switch that disconnects pin 1 from pin 8. I made an amp with a switch which allowed the amp to use el34 by making the connection via the switch. Then when you switched out you could use the 7027, 6550, 6l6gc, etc.

Gotta be careful with that though! I guess if you built the amp yourself you know it's OK. But on 6L6 amps, I often also use pin 1 as a tie point (connecting pin 8 to pin 1 with a current sensing resistor... pin 8 also gets a test point jack and pin 1 gets tied to ground).

 

[crispycircuit]

Radio man??? Never saw an EL34 in a radio....

 

[kcline]

Very sad the radio guy wrote El-34 on those boxes hope you can fix it up. On a relate mislabeled tube topic 2A3 marked as 45, I have had those wish I had some now to post pictures. 2A3 draw twice the current than 45,s to light filament, A radio friend found one of those 2A3 and placed it in a single ended radio that used 45,s it fried the PT opened the filament connection. Today 2A3,s worth more then 45,s in the past 1950,s into the 60,s 45,s worth more then 2A3,s is why you find these

 

[jmprest]

Most likely simple screen resistor, but that should have made a sharp snap sound that you would have heard, could you have mistaken it coming from the unit vs speaker?

 

[larryderouin]

That was Gorbachov to Reagan at the Reyklavik(sp?) talks in 1982 or so.

 

[gadget73]

I knew where it was from, I was trying to dance around the "no politics" thing.

 

[thomo57]

Most likely simple screen resistor, but that should have made a sharp snap sound that you would have heard, could you have mistaken it coming from the unit vs speaker?

I could have mistaken it because it was instantaneous.
Would it be be obvious from these photos. Thanks for any advice jm

 

[whoaru99]

Could be something on the other side of those boards. It shows resistor values but looks like those components are on the other side. For example, what appears to be 10 ohm resistors connected to pin 1 and 8 of each power tube, but mounted on the other side of the board.

 

[Dandy]

Yes, you'll probably see a burned out resistor on the other side. The problems with PCBs that they have two sides and the connections are less obvious than point to point.