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  #11  
Old 24th December 2020, 11:11 AM
Rhod Rhod is offline
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Join Date: Nov 2020
Location: Carmarthen,Wales
Posts: 5
Default Re: HD3S hum problem.

Quote:
Originally Posted by John Caswell View Post
Hi Rhod,
Just as a silly, please measure the heater voltage on the valve base pins 4-5 and report back here.

John
Thanks John, will do.
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  #12  
Old 24th December 2020, 11:20 AM
Rhod Rhod is offline
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Join Date: Nov 2020
Location: Carmarthen,Wales
Posts: 5
Default Re: HD3S hum problem.

Richard, I'm wondering if I might have 'cooked' one of the diodes (C3D04060A X4) or caps due to lack of soldering experience. I'll check for dry joints as you suggest, then look at replacing those one at a time. Thanks everyone for your input, I'll do some homework and get back to you. Merry Christmas.
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  #13  
Old 24th December 2020, 01:33 PM
bob orbell bob orbell is offline
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Join Date: Nov 2009
Location: kettering northants.
Posts: 2,169
Default Re: HD3S hum problem.

Rhod, the data sheet for the diodes may help you, it will state max heat and time for soldering that the component will withstand, if you are new to soldering avoid silver based solder and use flux past, not bakers acid flux, clean PCB and component legs with scotch bright before starting, done correctly you will see the solder get sucked into the joint, a blob is not good. Bob
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  #14  
Old 24th December 2020, 02:04 PM
A Stuart A Stuart is offline
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Join Date: Jan 2006
Location: Selkirk, Scotland
Posts: 302
Default Re: HD3S hum problem.

A cousin of yours? (3.40 minutes in) https://www.youtube.com/watch?v=I1IM37OY0Kg
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