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Viability of 6BQ7/6BZ7 tube in CSP2 (Read 4481 times)
Rivieraranch
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Viability of 6BQ7/6BZ7 tube in CSP2
08/04/10 at 03:14:24
 
There have been some comments elsewhere about substituting the 6BQ7 tube in place of a 6922. I do not note that anybody has tried that with a CSP2 or the other DECWARE equipment that uses the 6N1P/6922 tube.

One time I tried a 6CG7 and the amp was lifeless. Recently, somebody started a thread about using this tube and I shot it down, so to speak. The 6CG7 has lower transconductance, lower gain and it shows in the presentation.

However, I note that the 6BQ7 is similar electrically to the 6N1P - so much so that I use the the test parameters for 6BQ7 to test a 6N1P tube in my tester.

I would be curious whether anybody has tried this tube in a DECWARE.
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DECWARE CSP2+, TABOO MK III; SE84CKC; HR1; TRAPEZIUM DESKTOP SPEAKERS; TECHNICS SL1200MK5 turntable; Ah! Njoe Tjoeb CD player; MARANTZ 2226B, 2216B receivers; SENNHEISER HD-580 headphones
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Rivieraranch
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Re: Viability of 6BQ7/6BZ7 tube in CSP2
Reply #1 - 08/05/10 at 17:01:47
 
My real question is whether using 6BQ7 or close equivalents would do any harm?
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DECWARE CSP2+, TABOO MK III; SE84CKC; HR1; TRAPEZIUM DESKTOP SPEAKERS; TECHNICS SL1200MK5 turntable; Ah! Njoe Tjoeb CD player; MARANTZ 2226B, 2216B receivers; SENNHEISER HD-580 headphones
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Juan Antonio
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Re: Viability of 6BQ7/6BZ7 tube in CSP2
Reply #2 - 08/07/10 at 15:23:23
 
You should contact with Steve. Tube compatibility is a headache for me. Sometimes is not enough for a certain tube to be the equivalent in specs. Anyway I think it's not very risky in most cases and the mayor issue is to work with very similar electric values and perferming a bit different. Nevertheless each amp has their unique characteristics so I only take into account what the manual of the amp says or what the designer/engineer says.
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« Last Edit: 08/07/10 at 15:41:24 by Juan Antonio »  
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Rivieraranch
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Re: Viability of 6BQ7/6BZ7 tube in CSP2
Reply #3 - 10/24/10 at 17:30:17
 
Steve said that while mine was up there they used a pair of 6BQ7's as drivers and they did not have a problem with them. When I receive my CSP2+ back from DECWARE I will be looking into this tube.
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DECWARE CSP2+, TABOO MK III; SE84CKC; HR1; TRAPEZIUM DESKTOP SPEAKERS; TECHNICS SL1200MK5 turntable; Ah! Njoe Tjoeb CD player; MARANTZ 2226B, 2216B receivers; SENNHEISER HD-580 headphones
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Rivieraranch
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Re: Viability of 6BQ7/6BZ7 tube in CSP2
Reply #4 - 11/08/10 at 01:57:30
 
Now that the CSP2+ has been returned to me I tried some 1950's Sylvania 6BZ7 (6BQ7 equivalent) in all three positions. It seems more like using a 6DJ8. The 6BZ7 is lighter, but with a slightly forward presentation with slightly less bass.
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DECWARE CSP2+, TABOO MK III; SE84CKC; HR1; TRAPEZIUM DESKTOP SPEAKERS; TECHNICS SL1200MK5 turntable; Ah! Njoe Tjoeb CD player; MARANTZ 2226B, 2216B receivers; SENNHEISER HD-580 headphones
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Rivieraranch
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Re: Viability of 6BQ7/6BZ7 tube in CSP2
Reply #5 - 11/17/10 at 00:43:52
 
Now I have 2 6N1P-EV in the driver positions, with a CBS 6BZ7 in front. This combination sounds very good. It seems that there is more bass than when I used 3 Sylvania 6BZ7's. I have left the unit on for several days now and it is fine. I am running an old Sylvania 5U4G rectifier.
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DECWARE CSP2+, TABOO MK III; SE84CKC; HR1; TRAPEZIUM DESKTOP SPEAKERS; TECHNICS SL1200MK5 turntable; Ah! Njoe Tjoeb CD player; MARANTZ 2226B, 2216B receivers; SENNHEISER HD-580 headphones
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