HRD Bias Spec

[Tubebender]

You who know, what's the best HRD bias setting to save the amp at high volumes? (or is that dumb, do i mean save the tubes?)
Planning on dropping it down to 4ohms with the cool celestion loaded HRD extension cab and giggin it at moderate volumes.

Is the factory setting 60mA???

[phsyconoodler]

60ma is a safe bias setting for two 6L6's.

[rockon1]

From what Ive read installing a fan might be your safest best. Bob

[Tubebender]

From what Ive read installing a fan might be your safest best. Bob
really, a Fan? I've seen plenty of HRDs around here gigging, but never a fan.
TB

[rockon1]

Dont know if the problem area was corrected but Ive read a lot of posts cooncerning certain resistors getting hot enough to desolder themselves from the board on the HRD. I had mine for a few years and didnt have any problems though. At any rate a fan never hurts. Bob

[Tubebender]

Anyone else out there set their bias on their HRD with a multimeter?

What tubes, rating and bais setting did you go with?

[Ronsonic]

They seem to do fine with the factory 30mA per tube setting. Yep, 60mV across the 1 Ohm resistor at the bias measuring point.

[Tubebender]

opps, i guess i meant mv, Not mA on my original post. I'm at 67 Mv (multimeter at test point). Got a 4 ohm load with the hot rod extension cab for bigger live stuff. Maybe i'll drop it more. Got it up to volume thou, sounds good. Clean still breaks up at 6-7.
thanks.

[jmbstudios]

Not trying to hijack the thread, but I would love to start biasing my own amps.... and learning more about the inner workings of the tones I love so much.

Can this be achieved by using one of these...?

Is it this simple....?

http://i24.ebayimg.com/03/i/03/38/b2/6e_1_b.JPG

These are on ebay at around 27 bucks.