Amperex NOS Bugle Boys. Search for them on ebay.
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Almost always NOS tubes outperform the 6DJ8 made today. I have a AR SP9 MKll and I sell tubes. I know. The Reflektor tubes 6H23 branded Sovtek, are good. They are consistently noisier(hiss),and microphonic than NOS, even the less exotic ones, ie; GE 6dj8. If you can find NOS at a price you can afford, I'd get them.My favorites are Valvo Red Label, Siemans, and Telefunkens. These are all pricey.
One NOS tube not yet mentioned here I have heard in a SP9 MKIII(not MKII)which sounds good are Tungsram 6922's. They are extended,warm, and quiet. I have also used them to good effect in a LS25. At one time, Upscale Audio had recommended these to me for ARC gear(I do not know if Kevin still has these available). They may be hard to find, but I have recently seen them advertised at at tubeman.com.
thank you for your kind efforts to educate me.
Digging deeper on the different tube sites, I narowed
the picture and now,aparently, I have to decide in between:
7308 Siemens NOS Gold Pin; 6922 Tungsram ( NOS made in Hungary?);6H23 Sovtek and 6DJ8 Amperex NOS Bugle Boy.
Primary decision input factors:
- the system is very revealing ( Apogee Scintilla speakers )
so as less fizz as possible would be desireble, on one hand;
- there is a cumulated leaness mark in the presence area,
effect of the marriage between the Apogees and Bryston 7b ST's monos( mostly in the low midrange, as I got the combo to ruler flat linearity in between 500HZ-5000kz ), so I'll
go for the tubes which can give a big kick in the low mids.
The overall sound is very clear, and not cold anymore
( due to the c-j Premier 9 DAC with 6gk5 Mullard NOS mark )
but corecting the leaness in the low midrange, would be one further step in chaseing the Audio Nirvana.Any ideeas?
Thanks, one more, to all of you, and appologies for my broken English.