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...

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?

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

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...

Giving the NEVZ brown base another go. Sounded un-exciting last time but that was without any burn in, put it on the back burner since then and have come back to it today. Tube was made 12/82 so quite late production, tube does look pristine compared to most Russian tubes. Seems promising...

I saw earlier in the thread someone used ECC32, top tier tube i believe, only problem is it draws 50% more heater current than a 6SN7 so might fry a transformer with prolonged use. ECC33 is a safer bet.

Could be many things.... Cathode impurities could vary from one tube maker to the next, also the spacing between the cathode, grid and plate, grid material, maybe plate material and impurities? Also how the heater wiring is made, some might draw slightly more or less current thus boiling off...

That would be a waste of even the cheapest lead free chinese solder :laughing:

That happens to be around the ideal temperature for cooking a steak, coincidence?

Can use a GTA in place of a regular 6SN7, will likely last slightly longer due to the higher ratings. Using a regular 6SN7 in place of a GTA where the circuit has been designed around the GTA might have some undesired effects though.

Genuine 1578 on the left, this is the one you want.

Westinghouse D has a touch of warmth but it more or less neutral to my ears. Warm tubes: MELZ 1578, Brimar 6SN7, Sylvania Bad Boy, RCA 5692

Lyr 3 is quite a big step up from 1/2, 6SN7 is a very linear tube so that will have a lot to do with it.

I should have elaborated really, i was hoping for something in the price range of Bifrost, if posible to do it well that cheaply :)

Nice enclosure!! Where can i get one?

Anyone tried the Canadian current production 6SN7? Northern Electric i think the brand is.

It wouldn't worry me too much, most old stuff it's all through hole components, and took me only 10 minutes on youtube to learn how to desolder. A DAC would be different, i wouldn't fancy trying to desolder and swap BGA chips, tiny surface mounted components etc.

Also worth noting, if you see any voids in the bottoms of the pins, a nice blob of cardas quad goes in there nicely :)

The 1578 is a MELZ tube with metal base and holes in the anode, if someone is trying to sell you a 1578 Foton it's not legit. I bought my genuine 1578 from this seller, 100% legit: https://www.ebay.co.uk/itm/163458583392?ViewItem=&item=163458583392 I'd rank the genuine 1578 above a Marconi /...

OK so op-amp rolling... Ordered up a couple of AD8397's and a couple of DIP-8 adaptors. Unity Gain stable and 24v. But is there any danger of it oscillating in this circuit? Heard they can be quite fussy op-amps.

I ordered mine directly from Schiit US the EU version took a while for them to stock, even longer for the EU site to get stock, even with shipping and duty it was on a par with ordering price from the EU.

Might be worth a punt with the adaptor: https://www.ebay.co.uk/itm/WESTINGHOUSE-True-NOS-NIB-Date-Matched-Pair-RCA-USA-6C5-Metal-Vacuum-Tubes-100/223280853109?hash=item33fc937075:g:xAcAAOSwowtbmVyE:rk:2:pf:0

Brimar :)

Ordered the PCB and NuTube and also the parts from Mouser. The power adaptor says unavailable in my country (guess it's because it's US version) will the following be ok that i found on ebay...