F5 power amplifier

[Zen Mod]

probably you can use plain one , too

RTV Silicone is type used by all sort of mechanics , because is both temperature and oil resistive

[labjr]

Arctic Silver Thermal Adhesive

[Blink_PT]

Originally Posted by Zen Mod

probably you can use plain one , too

RTV Silicone is type used by all sort of mechanics , because is both temperature and oil resistive

I know, I have a brother in law who has a workshop and I've seen him put a black silicone to seal the bearings. I'll stare at a tube

[Renron]

Originally Posted by labjr

Arctic Silver Thermal Adhesive

Uh-oH, now you've done it. You're gonna hear about why you shouldn't use it....blah.....blah......blah. Conductive.........short out.........My F5 has it on the Mosfets for 4 year, I use it every day. NO problems. Not the adhesive btw
preferred straw color is red

[6L6]

Guys with finished F5 -

Would someone with a scope (or really, really nice AC voltmeter) measure how much ripple you have on your rails?

I have 134mv peak to peak and curious if that's a lot or not bad.

I have a speaker hum and can't figure it out...

[Zen Mod]

usual procedure : words and pics , so we can figure out is it magnetic coupling or wiring deficiency

[oneplustwo]

Originally Posted by 6L6

Guys with finished F5 -

Would someone with a scope (or really, really nice AC voltmeter) measure how much ripple you have on your rails?

I have 134mv peak to peak and curious if that's a lot or not bad.

I have a speaker hum and can't figure it out...

With my fluke 45, I just measured 13mV on both positive and negative rails. So yours is 10 times worse....

For reference, I can hear a tiny bit of hum with my ear up against the speaker but not at all when farther than a foot or two away.

[6L6]

Originally Posted by Zen Mod

usual procedure : words and pics , so we can figure out is it magnetic coupling or wiring deficiency

Ok.

RCA jacks isolated from chassis. MAG here -



PSU --> AMP --> speaker connections shown here




Other than those photos, everything else as in this thread - all photos in top 2 posts.

An illustrated guide to building an F5

[Zen Mod]

grounded inputs - same reading ?

what's happening when you feed just one channel with present PSU ?

[biju55]

Remove the -ve wire ( black ) to speaker from amplifier board , and connect it to power supply board ground .