Edited by Jose C - 11/25/13 at 12:30am
Was hoping someone more familiar w/the circuit might chime in...
In the absence of real insight into this, from looking at the schematic & searching this thread for "cold" and "R21" would suspect one or more of the 8 transistors toward the center of the schematic - e.g. R21, the sand parts + resistors that influence the output transistors & the output transistors themselves.
Here's a couple diag sessions from this thread:
Sorry to drum this back up. But I am about to start my build up and need a power supply. Which one should I use, or at least what do I need in terms of power requirements?
I want to use an telefunken ecc 86 to start with. I’m not sure if I need a heater power supply as well, and if so can you tell me what I would need? If you have mouser part numbers that would be cool. I’m about ready to make an order from them
Here's the power supply: http://www.glassjaraudio.com/product.sc?productId=3&categoryId=2
It has been years since I had considered building one of these, life has gone up and down, left and right, I hadn't used headphones in a long while. I finally got back into the hobby. Got another pair of MS-Pro's and bought funch's EHHA from a member that had purchased it from funch couple of years ago. This thing sounds amazing! Just such an effortless presentation of sound, highly detailed, excellent instrument separation, no grain, its smooth but never syrupy. This is it folks.
The tubes on this are still the original A Frame German GE's, I have ordered a set of NOS Pope Holland 6GM8's, anxious to hear those.