Sounds verrry close to a Van Waarde ... and it shares the major disadvantage of this amp in that it can only reliably drive high impedance phones.

Quote: Would you say it was a difficult build? Not exceedingly difficult: the process of assembly was similar to any other through-hole board. However, the density of parts on this board is significantly higher than in most amplifiers, which leaves out several luxuries present in...

Well, I'm impressed. My SOHA Jr. (or whatever it eventually will be called) is up and running, and it's sounding pretty great with an RCA 5963 that I fished at random out of the 'AU7 box. I tend to fall in love with every new amp that I build, but I think this little guy is something special- a...

Well, I'm pretty psyched. I just put my orders for components in, so given a small amount of luck with the postal system everything should be in place to start my prototype some time next week. I have a small range of slightly more 'unusual' dual triodes lying around which might work well in...

Quote: Originally Posted by ludoo So the NY address on the box is bogus? Or is this an example of cold-war globalism? The Soviets raised extra hard cash by selling their products on the international markets, in the case of vacuum tubes and other electronics through a...

The use of a flying saucer getter and the style of the mica supports suggests Soviet manufacture- a reboxed and relabeled 6n23p? I'm going to guess from the Reflektor and not Kaluga factory as the plate ends appear to be closed and not "pi-shaped".

From what I've read, this process takes a lot of time and care and a lot of experimentation to set up right. It seems to be basically the only clean way to do high-density packages at home without shelling out for a rework station, but for run-of-the-mill SMD stuff the pick, place, and solder...

The SOHA does show significant variation between tubes; it's definitely a rollable design. In fact, the SOHA probably shows more differences than other amplifiers because of its strange operating point, which sits outside of the 'design range' of the 12au7. That said, I don't know if it's...

Kwtubes (Gintaras Sakenas) is a very well reputed seller and my personal experience with him has been excellent. Note that you'll have to pay with a money order though, no paypal. I'm not a cap connoisseur but the K40Y9 series is reputed to be of very high quality. In general, the Soviet...

If there's a hamfest coming up in your area, you might want to give that a try. Hams are usually happy that their old equipment gets used and aren't as tied into the price-gouging eBay scene, so you might be able to get a tester for a price that's closer to what it's really worth.

The 262B6 looks like a handy solution... Unfortunately none of the typical hammond distributors seem to have it in stock. The 262E6 seems to be in stock at mouser but is way overspecced for the task; something probably would have to be done to keep the filament voltage down...

Yeah, I'm pretty sure the polarities are right. I'm a little loath to send them back as my order did not specify gain class; I'd be in the same position with no ability to complain if these parts were properly labeled as V grade. My big worry is that I got another brand of JFET relabeled as...

I've been preparing for the upcoming set of amps that use the 2sj74 and 2sk170 by trying to match up for Idss and have run into a bit of a problem. I ordered 2sj74-BL from B&D and a mixed assortment of 2sk170 from Futurlec which turned out to be mainly BL with some GR. The 2sj74 tested just fine...

The DN2540N5 is in stock in single quantities; it's the N3 that's not available right now, so you can still get it if the irf820 is less convenient.

RS electronics in Novi still has a storefront, but it's kind of overpriced and depressing. They do stock Weller supplies, though.