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No. It just caused a large hum at low output levels. I fixed it. I'm sure it was done at the factory. Hard to believe it could have been done during a repair: why? The FG504 manual mentions all this

Although English is not my mother tongue (Dutch is), I fail to see why using the term "Grid Bias Adjustment" for 'scope CRT's is wrong. If I'm correct, two reasons are given to disparage the term: 1.

Jargon is always contextual, to the application, and the particular [engineering] culture. (Interpreting the parlance in the vernacular, can result in misunderstandings.) Bias: In an electron tube, a

David Campbell wrote: In my defense, I was just following the diagnostic procedure in the service manual, and my circuit analysis skills are subpar. five of the transistors and two diodes in the

I think this is the right datasheet for the original: https://www.onsemi.com/pub/Collateral/D44H-D.PDF The bipolar transistors optimized for switching power applications tend to have low gain and

Hi everyone, After a long time on the bench, finally my 2712 is alive and work 100%. Using the suggestions that I received here, I start the service. First I have made a visual inspection and look for

Michael Lynch wrote: Yes, I measure 81.78 V across VR1374, which sounds like it's in spec (sadly, that would have been an easy replacement). All of this is making me think that the problem must

I am sure you in the US are aware and may have experienced this with mailing packages and letters for the holidays, but US mail has been considerably delayed, though it has gotten somewhat better in

A few things are missing from the descriptions. 1. There was a blank module available2. The modules could be user keyed for certain slots3. They could be interconnected unseen in the rear.4. There

I am also interested in a set of boards. Bruce, KG6OJI

FAN to you, too, Giovanni! I agree with Thomas that something rather generic, like the TIP31C that he mentioned, would probably work just fine. Even though it's an obsolete transistor, it still seems

I would also like a set of boards. Thank you for the great project, for the time you spent, and for the clever mechanical and electrical engineering.

Let’s see…. Dennis’s time of xxx hours times a $50.00 hourly rate to do all of this equals $xxxx.xx. Although it is only one book for me you have put in a monumental effort to get all of this

If you might indulge a few inquiries... Did incorrect phasing damage the FG504? Is that something you did to the TM504?... or was it miswired at the factory... or during a "repair, someone else?" Do

This had been done, many times... and there is much ink spilled about it, on this forum... and on the Web... that is... if you are mentioning about something (a cable, or board) that plugs into the

Dennis, you're a saint! Sorry that no good deed goes unpunished! Happy New Year, Tom Sent from my iThing, so please forgive the terseness and typos.

Chuck, Thanks for that as I did not feel qualified to make such a statement, based on my very limited knowledge of the subject. Appreciate that you have confirmed that I am not totally without a clue.

Dennis, THANK YOU. I know that we do not say this enough for all that you do to keep this group running smooth. You are GREATLY appreciated! Sincerely, -- Michael Lynch Dardanelle, AR

That and perhaps what he asserts is nonsense? The grid is most assuredly biased relative to the cathode on this, and probably any, CRT. -Chuck Harris Michael W. Lynch via groups.io wrote:

Hello Many moons ago I saw a topic on here regarding the 2230 and a storage display problem and as far as I could tell it never reached a conclusion. Unfortunately it is the problem I have now...or