Bias adjustment


I need to set the bias on my vacuum tube amplifier.  Does anyone know where I can BUY an amp meter that reads milliamps?  Most I have seen are for large AMP applications.
128x128richfrank
+1 @testpilot   at what point does a consumer have a legal or ethical right to a firm's intellectual property just because they purchased a product?
How on earth are you guys measuring bias while running a musical signal? The bias moves up and down continuously while the music playing. It must be idle to measure it accurately.     
@oldhvymec- If you’re interested in doing a HEXFRED update, on a Cary product, PM me.     I can talk you through it.     Did my SLM-100s, without their help.      Virtually, every other component I own, as well.    I also have pics, if we can figure out a way to communicate them.
+1 @testpilot   at what point does a consumer have a legal or ethical right to a firm's intellectual property just because they purchased a product?

When he wants to fix it.. Like I've done for over 50 years. What a dumb thing to say. Is there a repair manual for my 40,000.00 intellectual piece of property setting in my driveway? YES it's required by LAW.. Even a friggin RR provides a complete manuel front to rear on their intellectual property..  Bower, corp. 1-20 million dollar machines, EVERY nut and bolt
location, and where it was bought. Think before you speak, I own the damn thing, I have the right to fix it, especially, if I can do a BETTER job...I am qualified to fix what I know, not what you don't...

Regards Op, rude person no regards
three_easy_payments929 posts04-24-2020 2:42pmHow on earth are you guys measuring bias while running a musical signal? The bias moves up and down continuously while the music playing. It must be idle to measure it accurately.  

I just checked as I read. hee hee, I'm running 4 valves 2 per side.
I'm biased at 75 ma with 0 reading on the LED, or the blue stick meters.

I cranked it quickly to 80% 76 ma and back to 75, on the button.
Mine didn't change a bit...

The point is it should not effect his Cary, my Cary, VTL, HK Citation II
to the point of BURNING up tubes. Even if he did do it that way.
The guy said 130ma or something, suppose to be 75ma..
Broken analog meter, not plug in right, DUNO,, a mistry..

Second, some folks pull the signal tube to bias.. then there is NO signal at all, A real tube tec, red sock, blue sock guy, had me do that a time or two..running down a problem on a pair of old western electrics..

Regards