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FDP Forum / Amp Mods, Repairs, and Projects / Noisy rectifier tube?

Mars Hall

USA NW Indiana

Dec 26th, 2017 07:08 AM   Edit   Profile  

A Sylvania "made in Britain" GZ34 makes a fizz or buzzy noise when operating, as if internal components are vibrating. Is this an indication the tube may be starting to go bad? The bias and plate voltage stay consistent. I replaced to tube, just in case.

Contributing Member


RonHalen Jokingly He Says
Dec 26th, 2017 07:17 AM   Edit   Profile  

Does the new Rectifier do the same thing?

Mars Hall

USA NW Indiana

Dec 26th, 2017 07:22 AM   Edit   Profile  

No it does not.



Dec 27th, 2017 07:31 PM   Edit   Profile  

It may have to do with a components "mis-alignment" and was probably doing that since it was new. If it's mine, I toss it. Yeah, I know it's a Sylvania/Mullard but it won't serve any purpose if you save it.

Doc Sarvis
Contributing Member

USA/Salt Lake City

Tuned Strings and Tight Lines
Jan 3rd, 2018 07:47 PM   Edit   Profile  

You could try tube dampers. I use them on a couple of tubes in my older Victoria Sovereign. Both the EF86 and 6BM8 have oscillation issues that resolve with dampers. I always have extras on hand. This is of course if the tube tests "good".

Mars Hall

USA NW Indiana

Jan 4th, 2018 03:47 AM   Edit   Profile  

As t turned out, the tube ended up failing. Thank you all.

FDP Forum / Amp Mods, Repairs, and Projects / Noisy rectifier tube?

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