I've used 6N23P which is pretty much identical to a 6DJ8 and also used 6N1P. 6N1P sounds much better. Quite a few here have both, can't remember specifics but i remember i enjoyed the Westinghouse more.

My RCD tripped the other day (g/f was cooking, say no more) but headphones were ok, they are HE-500's though so maybe planars fare better.

I bought mine from ebay seller Nixie Store, can't see any more advertised but might be worth shooting them a msg to see if they can source some more. https://www.ebay.co.uk/str/nixiestore/Vacuum-Tubes/_i.html?_storecat=12424677

I posted in this thread a while back, haven't got the tubes anymore i sold them on, couldn't justify keeping them at the price :) Post below... Also pretty much done rolling now, my dad is getting old and pretty much retired so started taking him fishing again which is another expensive...

Bangybang probably bought them all for his relabelling operation.

I've actually had 2 of these B65's in the Lyr 3, really not worth the money when you can get Brimar for 1/5th of the price.

For me i found early on in owning Lyr 3 that gain setting makes no difference to me so have been using high gain since then (planars), never tried low gain with the 1578. Something else i find weird though but could be my imagination, sometimes when volume pot is lower than i would like for...

Earlier in the thread i think people used 6SL7 with no ill effects so 7F7 will be OK. 7AF7's do seem scarce though and a little more pricey than 7N7.

7AF7? :) The round plates seem a bit of a giveaway, and reportedly better sounding than 7N7 types. Question is, i'm too lazy to read up, but do they share same pinout as 7N7? or need another adaptor?

Output power into lower impedence loads (25-50ohms)? Remote control?

Yes couldn't hear any differences. Haven't tried the unobtanium Brimar 13D2 though, that is supposed to be a different beast.

Nothing in it really except for minute tube to tube variation. Probably hard to find because the same people who pay for triple micas, gold pins, pinched waists and D getters in other tubes think the black glass makes them somehow special.

Only mods i've done to mine is silver cable (made no difference), Lawton Audio angled leather pads (really good, better soundstage and confort) and i've removed the cloth from the grills which has made the sound a bit more airy. Paired with Bifrost 4490 Gen 5 USB and Schiit Lyr 3 I'm happy...

Been able to have a good listen to the NEVZ 6N8S '82 Brown base and it's quite a nice tube. Over all quite a "tubey" sounding tube with a mild U shape Bass extends real low and has a lot of heft, maybe a touch boomy but not excessively so. Mids have liquidity but a touch recessed. Treble...

Not sure i'm putting this in the right place, mods please move if that's the case :) I'd like to draw some attention to the GBVP, Brimar are looking to bring Valve manufacturing back to Britain and are looking for volunteers to make this happen...