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Discussion in 'Amp Tech Center' started by Achysklic, Oct 18, 2020.
V with wave form line = AC
V with line underscored with ... = DC
Your meter is set for VAC
Red probe on rectifier pin8. Blk probe to ground. Meter set to 600 in the yellow section of the dial.
If no VDC on pin 8 then switch to VAC and put probes on pin2 and pin 8. We are looking for 5VAC heater voltage for the rectifier tube.
6.7v on 6v6
5.5v on rec
Check to make sure the rectifier tube is inserted in the socket correctly. You may have a bad rectifier.
Yes seated really good was a brand new tube
.EDIT I had that backwards.
Rectifier red wires to pins 4 & 6
Yellow to pins 2 & 8
I rechecked pins 2,8 on rec VAC they are pin 2 is 2.0v and pin 8 is 2.7v
Does the rectifier get warm from heater voltage?
BTW heater voltage is always measured with a probe on each wire.
Rec pins 4&6 is 388v
On yellow pins 2&8 show nothing
Being brand new doesn't mean it's not defective. You should try another rectifier tube if you have one. You have voltage on your rectifier heater pins but the tube is not heating up which sounds like a defective tube.
You would also be well advised to be doing all of this plugged into a light bulb limiter until you solve your problem and make sure you have no shorts in your amp. A current limiting device of some sort is a necessary tool for working on amps and going without one puts you at risk of destroying a power transformer.
Disconnect pin 8 yellow wire. With power *on* measure with probe on that wire and the other probe on pin2. Looking for 5VAC from the PT.
Can I make a light bulb limiter or buy one . Also I have no other rec tubes. Plenty of everything else though. Figures
Ok hang on
On pin 2 and wire from 8 got 5.5vac
If you have 5 VAC on the rectifier yellow wire, then pull the rectifier tube and meter for resistance and/or continuity of pins 2 & 8 of the tube itself.
If you look about half way down this page, you should see "Standard 5E3 DC Voltages".
If you are not getting readings *in the ballpark* of these voltages, start looking at the rectifier wiring and/or the rectifier itself.
-- but it looks like others have already pointed that out.....
Umm my rec tube doesn’t have a pin 2 ????
Ok I looked at pins wrong on tube. Anyway it is getting all green lights for good conduct on pins 2 & 8
It's the pin closest to your thumb in that picture