Tube Amps / Music Electronics
For current discussions, please visit Music Electronics Forum. New: view Recent Searches.
New: visit Schematic Hell!
The sunn still shines online!

Listen to great tunes streaming live right now!

ampage archive

Vintage threads from the first ten years

Search for:  Mode:  
previous: Carlo M/J, MCM has a Tenma 10A variac (0~... -- 9/3/1999 5:27 PM View Thread

Re: update

9/4/1999 12:58 PM
M/JRe: update
My voltage in the house is at 110. Seems to be holding at that as I have measured it several times. I did the same mod with the 1k at the screens on another DR last night and it dropped the voltage at the screens and my bias a 1ma but nothing like what I saw in the first amp. The second amp is running at 422@26.5ma This amp also sounds a lot cleaner than the first one (almost like a twin). I tried swapping tubes from one amp to the other to see if that made a difference but nothing changed. There must be something inside that is doing this. Maybe its a variance in the PT? Amp "A" is a 70 model with the proper tranny's and amp"B" is a 73 but the PT appears to have a 78 date code on it. If I get really anal about this and really want to know what the difference is I may check the values of all the resistors in these 2 amps. The 70 sounds better than the 73 to my ears. The 70 has the lower plate voltage. Still can't figure out why I had that big voltage drop. Thanks for the variac info Carlo. I'll shop a little bit before I buy.  

Bruce That 422@26.5ma is a weird email ad... -- 9/4/1999 3:18 PM