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Tube rolling the CSP2 (Read 10067 times)
Francesco
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Re: Tube rolling the CSP2
Reply #30 - 09/29/13 at 13:38:32
 
I Riviera ranch
Wath is this the tubes configuration for your Preamp?
du you use the 6Q7B, wow is sound?
Francesco
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Rivieraranch
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Re: Tube rolling the CSP2
Reply #31 - 09/29/13 at 18:31:34
 
Lord South here is the expert on tube swapping in this amp.

I am using GE 6BQ7A tubes screened for Tektronix. They are drier and more accurate than the standard 6N1P-EV.

You might want to start with 3 6N1P-EV tubes in all positions and work from there.

Try 6BQ7A; 6922, 6N23P, 7308 and if you haven't lost your mind then you can venture into the exotic - E188CC; E288CC, etc.
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KobeeDog
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Re: Tube rolling the CSP2
Reply #32 - 04/26/14 at 02:07:03
 
I have a spare Gold Lion 6922 laying around. Has anyone tried this tube in the #1 position?
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will
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Re: Tube rolling the CSP2
Reply #33 - 04/26/14 at 04:26:12
 
I have tried a lot of various tubes in the first postion. It will work there. Why not give it a listen?
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KobeeDog
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Re: Tube rolling the CSP2
Reply #34 - 04/26/14 at 20:00:42
 
Tried it. Sounds pretty good. Sounds more and airy than the previous tube in there, which has always been my experience with 6922 tubes.

I'm guessing 6922 will work in the other spots as well?

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Lon
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Re: Tube rolling the CSP2
Reply #35 - 04/26/14 at 20:14:25
 
Yes, it will.
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KobeeDog
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Re: Tube rolling the CSP2
Reply #36 - 04/29/14 at 02:46:16
 
OK, I tried the 6922 in the front slot and it caused a noticeable hum, an unforgivable sin, in my opinion.

I put the original tube back in, and no hum.
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will
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Re: Tube rolling the CSP2
Reply #37 - 04/29/14 at 04:10:34
 
I am a little confused. I thought when you first tried the gold lion 6922, and it sounded good, it was in the "1st" or front position??? I suspect that if it caused hum there, it is likely that tube itself rather than the tube type or the pre-amp. In my experience, it is the second position (pair) that can be a little tricky.
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« Last Edit: 04/29/14 at 04:48:07 by will »  

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KobeeDog
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Re: Tube rolling the CSP2
Reply #38 - 04/29/14 at 11:40:00
 
The preamp originally came with a Sylvania tube (not sure what kind, but I don't think a 6922) in the front position.

I swapped that out the other day for the Gold Lion 6922. I'm not sure if the hum started last night (when I first noticed it), or if it had been there all along.

I suspect it just started, because with music not playing, I can hear the hum from my listening position, about 10 feet away. I would have noticed that before, right?

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