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Cary Audio Cad 805 AE tube rolling

Hello;

Anyone have any experience with tube rolling on the Cary CAD 805 AE?
The best 211 I tried Amperex vt4c brass base.
Best 6sn7gt I tried mullard ecc33 as input tube and fivre 6sn7 black plate ('50 years) as driver tube. Sylvania 6sn7w metal base , tungsol RP and RCA 5692 red base were disappointing!
Standard 300b (cary audio) is ok but 300B wesatern electric ('90 years)is awesome....

Thanks, Michele
micheler
casouza
239 posts
 
Michele, you may want to read this thread about the latest 300B:
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1240592110

I see that you did not like three slightly bright 6SN7 variants.
You may want to try Sylvania JAN 6SN7WGTA brown base as driver tubes, they sound very smooth and organic.

Fivre tubes were made in Italy under license from RCA, so I believe you will also like early grey glass, black plate 6SN7GT tubes made by RCA in the 40s. These are also available as ex-military stock JAN VT-231

I have no experience with 211 type tubes, but I believe your amp can use 845. The 845 is a more linear tube than 211. Ask Cary. If the switch is doable, you will not regret it.
good luck
gtshelby65
17 posts
 
Casouza,

The 805 AE can use both, and actually comes with both. A buddy of mine has a pair and he prefers the 211s to the 845s, I prefer the 845s. It all comes down to taste, which I think is why Cary put in a switch to allow both tubes. Very cool idea IMO...
micheler OP
2 posts
 
I tried also rca vt231 (1944) on cary but fivre is superior on linearity and coherence.
I tried also raytheon vt231, marconi-gec b65,kenrad vt231, sylvania vt231 and mulllard ecc32 but for me ecc33 mullard+fivre 6sn7gt black plate are awesome!
The best sounding nos 211 is Amperex brass base (Taylor and RCA are good, GE also).
For 845 tubes I tried United with the glass support on the top, is marvellous! No experience with RCA or GE.
A friend told me that an amplifier is best sounding with 211 tube or with 845 tube...... never with both!
It is true?
Thanks, Michele.
casouza
239 posts
 
Michele, thanks for sharing your tube-rolling experience.
If I understand you question correctly, yes, tube amps must be used with a specific output tube to sound their best, however, the switch that Carry provides probably changes a few electrical parameters to make the amp compatible with 211 AND 845.
micheler OP
2 posts
 
Hi Casouza thanks for the help.
If I change 211 tubes (GE, Amperex, RCA etc etc) it's needed rebiasing amp?
For 300B tubes there is a trimmer for rebiasing, no for 211 or 845 tubes!
Regards, Michele
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