Thanks for the interest! For a long time I have wanted to try a 2A3 SET amp in my system. I have previously had a 300B stereo amp and 300B monblocks (2 per side, switchable from single ended to push pull). I have been in this hobby (Hi-Fi, not DIY) for a long time and wanted to put together something I thought might be extra nice. So my changes do not reflect any degree of seasoned electronic wisdom, but rather the choices of a fairly hapless hi-fi enthusiast picking things he thought might be nice, or at least fun, after doing some research.
On the top I used Mullard 12AT7’s that I have had but have not used for a long time. Years ago they were used in a full function preamp. They are exceptionally quiet and sound good.
I kept the stock Sovtek 2A3’s, although my past experience with Sovteks has not been great. ( To say nothing of those Russian ‘Gold Lion’ 300Bs, although I may have just had a bad batch - I replaced them with Emission Labs, which are great.)
This was my second DIY project, after building the Quickie last winter. While building said Q I screwed up some RCA soldering and in trying to undo my error pretty well munched one of the stock RCA’s. This time I decided to use something I thought could be more robust (and silver!) so I got some Audio Note RCA’s.
I have always liked the Cardas binding posts on my 300B SET so I got some rhodium (silver!) ones for this project.
On the Quickie I used an Audio Note volume control which I like, so I used one of those here too. The balance and selector controls are stock.
Down below I went a little cap crazy. Jupiter HT’s for the 3.3 caps and V-Caps for the 1.0 uF’s.
For reasons that probably defy rational analysis I used Duelund and Neotech solid core copper hook up wire. I used the stock green wire from the power transformer.
When wiring the RCA inputs the supplied Cat-5 wire pretty much got the best of me. So for two of the three inputs I used twisted pairs of the Duelund and Neotech. In the result those inputs are very quiet, and I think they have a fuller and richer sound than the Cat-5 input. But I have not spent a lot of time on the comparison.
I don’t think I have forgotten anything. This amp sounds great. Quietest I have ever had in my system (music is almost 100 per cent vinyl, currently with Lowther Medallions, so if there is noise you’ll get it - they are supported by an REL sub). I am eyeing Emission Labs mesh 2A3’s but with no urgency whatsoever. I am enjoying this amp too much as is.
I’ll post a pick of the innards later, can’t do it from this iPad.
