|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
166.248.4.185
In Reply to: RE: NYAL OTL 3 posted by v_n_naidu@hotmail.com on June 06, 2012 at 01:17:04
How much plate current are you drawing? Lift the positive leg of the bridge rectifier and insert a meter, if you are over 500ma dial it back to around 350, sounds like you are running them too hard and the ones that do not glow can withstand the high current and the glowing tubes cannot.
Buy a set of tubes from Roger Modjeski, (ram tubes) they are the best you can get.
Follow Ups:
Hi 714rhino,
Thanks for your reply. To date it appears to be the most appropriate solution to the problem with the OTL3.
Would like to check with you, instead of lifting the positive leg of the bridge rectifier to measure current, could I set the current (350mA) and center balance by adjusting R16 and R23 as indicated in para 9 of the biasing instructions.
Thanks & Rgds,
Nara
Sorry not to get back with you sooner, I will send the alignment procedure to your e-mail tomorrow.
Thanks 714rhino but I do have a copy of the instructions. I am not up to it to bias the amp and would be getting a tech competent friend to do it for me soon. I was just wondering if in the meantime I could just set Ip and balance as indicated in para 9 of the instructions and see if the glowing stops.
Rgds,
Nara
Do the full alignment procedure as described in your manual, if you cannot get the amp to align properly you know that there is a problem either with the tubes or a passive component causing a problem, cap/res...etc.
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: