MHDT Orchid TUBE ROLLING

I just ordered the adaptor from garage1217.
Do you think this tube will be ok?

https://www.thevalvestore.com.au/home/77-6n23p-ev.html?search_query=Soviet+reflector&results=14

that russian tube will give a spotlit treble, a recessed midrange and decent bass in a mhdt dac, i personally think it hurts the sound in the midrange, where the dac should really shine

i would suggest an old stock european 6dj8 equivalent tube from tungsram/hungary or ei/yugo if you are trying to stay at a reasonable cost (otherwise go for mazda telefunken or dutch amperex ones which are $$), these will give a nice lively treble but the midrange will be much more textured and palpable

one other important note... the g1217 adapters have long pins... do NOT insert them ALL the way into the mhdt tube socket, or the adapter pins may damage the underlying socket solder joints ... ask me how i know  :(  -- instead, look at the pin length of the stock 5670 tube and insert the adapter socket only that far into the mhdt dac tube socket

Hi jjss49

How do you know how the Russian tube would sound? Is that from experience with one, or from someone else's review, or is there a "way to tell" ? 
I've just tried the Russian tube today (the adaptor just arrived today) and the supplier chucked in a 6dj8 from matsushita. Might try that also. 

If all else fails I'll remove the adaptor and go back to the  TESLA 6CC42 pinched waist, military edition i was using. 

Hi jjss49

How do you know how the Russian tube would sound? Is that from experience with one, or from someone else’s review, or is there a "way to tell" ?

i have it here, have listened to it - it is the only way to know, for sure

i have many pieces of gear that run 6dj8 equivalents... i have quite a collection of these tubes (~200 accumulated over the years), probably 15-20 different makes and variants... and have listened to most if not all of them all over time

Try a NOS Siemens, Telefunken or Valvo CCa. All-but-equal is the Mullard CV2492. The Tesla 6CC42 is very good in the native socket, as is the excellent Bendix 2C51, but these alternatives in the 6922 family via adapter are in all ways better.

Phil

I’ve been considering an Orchid, and I just noticed on the LTA website that the WE396A upgrade is unavailable, but they are offering an Ericsson 5670 for the same price. With all the hoopla about using 6922 or 6SN7 converters, I’m wondering if I’m better off skipping the small tubes altogether and going straight to bigger tubes. I see the 6SN7 requires a case mod and the tube sticks up quite a bit. Does the 6922 require a mod as well?