2013年9月15日 · I built the Moth audio direct-coupled 2a3 circuit, preferring it to the Moondog (which is still a GREAT amp!) and designed a direct-coupled input-driver (which eliminates one coupling capacitor between the two 6sn7 sections) 300B …

2007年5月15日 · hey-Hey!!!, The PP 2A3 can be a very nice amp. Keep it class A, and perhaps run a 6k6 a-a output TX. As designed AB1, its plate load dropps to ~1k2...and that's not any fun. For a few more watts, build a different amp; leave the 2A3 to deliver a nice 6W from a conservative operating point.

2015年5月3日 · The seth 2A3 should put out right at 8 watts before clipping . The UTC LS-57 are some of the best output transfomers ever made they are semi toroidal wound on a permalloy core

2004年10月21日 · The Seth is a perfect amp to learn as it is a really simple schematic. Just take a look at it and judge by yourself if you are comfortable in building it or not.

It is a two stage design where a 6C45-Pi drives a pair of 2A3 in push pull class A. The PSU is a double pi filter, making for a very low ripple. This amp is self biased. The pair of 2A3 shares a …

2015年5月3日 · Very very nice layout with that Classic McIntosh mono block vibe. 1. Sanded the bare metal/ bondo with #600 wet/dry using an electric sander. 2. One coat of metal etching grey primer ( no reason other than I had 1/2 a can. 3. Two coats of a sandable grey auto primer. 4. Hand sand with a rubber block #1200 sandpaper, then. 5.

It is a two stage design where a 6C45-Pi drives a pair of 2A3 in push pull class A. The PSU is a double pi filter, making for a very low ripple. This amp is self biased. The pair of 2A3 shares a …

For sale is a pair of Seth 2a3 push-pull Class A monoblock amplifiers in the Seth II iteration, using a 6h30p driver tube rather than the originally spec'd 6c45. These have a great sound and …

2005年1月5日 · Assuming less than perfect match, the Seth would be better with individual bias for the pair of 2A3. Since in my case I measured a 1 mA unbalance, I decided not to go the extra mile. But to answer your questions:

2011年8月20日 · I have very quick questions: *) I did not see the most important part according to Jeff EXO 173 in the iron price list. *) There are MQ alternatives to Hammonds in Jeff's list. Are …