Headphone Amplification

I finally got this guy from fed ex this morning but have only listened to a few CD's on it. So far I like it over my old amp which was an SR-71 [sic] and sick. I'm using this amp with my only piar of reference headphones that I have on me right now which are HD650s. When I get my sr325's back I'll see how this amp pairs with them. I'm using them out of a harman/kardon hd710. This is the most laid back amp I've heard, though it should be noted that I haven't heard a lot. There is a real focus on the midrange and upper midrange. Trebble is present but this amp is by no means forward. This amp produces little bass and what bass there is has little punch. That's the only …

Damn you LAiV. Just after I’m satisfied with your Harmony µDDC and µDAC you release a new, cheap combo DAC-headphone amp. Yo Rob!

Dear All - What tube improvements can be made to Stax007tA over the stock tubes? Are matched pairs available or is there any change needed to be done to the board? Also any recommendation on exernal PSU to improve SQ? Thank you

Can you help me with schematic of Stax SRM007tA amplifer please ? (100 V Japan version)

AnTek transformers are made in China. I purchased the AS‑4T400 (400VA, 400V) transformer and the AS‑3T350 (300VA, 350V) tube transformer to build the Blue Hawaii and Carbon amps. The cardboard packaging had “Made in China” labels, and some of them were partially peeled off. If I had known they were made in China, I might have bought them directly from Taobao.

I have a KGSS-HV that I acquired years ago from a local builder. It has Sanyo parts and +/- 400V BHSE power supply. I started using it again last week after years of storage and it seems to be working great with my L700. Question: Does the KGSS-HV need periodic maintenance? I ask because in troubleshooting my SR-009 hum on the right channel, I read about DC offsets and balance. Are these something I should be checking periodically?

Hi everyone, I have a question: how do you select an output transformer for Stax headphones? I’ve built a circuit using 2A3 tubes, but I’m having trouble with the output transformer because I don’t know how to calculate the specs—though the LL1660 is said to be suitable. I want to order a custom transformer for 2A3 and 845 tubes.