- Jun 19, 2008
any one try upgrading transformers on this? or at least know the specs of the OT's and choke? the RCA 832a's sound really good and not broken in yet
The OTs are one of a kind with no other manufacturer makes. Specification is here: https://www.head-fi.org/f/threads/civilian-6n2-fu32-tube-headphone-amp.671419/page-3#post-10853175
Given the price of the amp, it does not have much economic sense to upgrade the OT and choke. You may want to try replacing the stock PIO coupling capacitors with Russian FT-3/FT-1 capacitors if you want more resolution, which can be done relatively cheap.