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Topic: Reverb tank substitution |
Mark Herrick
From:
Bakersfield, CA
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Posted 3 Mar 2004 3:56 pm |
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I know that reverb tanks have input and output impedence ratings, but how exact do you have to be in substituting a different tank?
The tank in my SFTR is a 4AB3C1B:
Input: 8 ohm
Output: 2250 ohm
Can I substitute a 9AB3C1B:
Input: 10 ohm
Output: 2575 ohm
What effect will the different input and output impedences have on the amp? |
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Ray Minich
From:
Bradford, Pa. Frozen Tundra
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Posted 3 Mar 2004 4:25 pm
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| Given that the replacement has higher resistance readings than the original, you can safely "substitute" for a trial. Had the replacement been lower resistance readings I'd be hesitant. Can't say what the effect will be. Perhaps Mike Brown from Peavey has some insight on the effect. |
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Jay Fagerlie
From:
Lotus, California, USA
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Posted 3 Mar 2004 4:47 pm
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Here you go Mark, a chart that shows how to decipher the part #.
You can right mouse click it and save it.
 So it looks like a replacement, the style difference is the '4' means 2 springs, and a 9 is 3 springs.
Jay[This message was edited by Jay Fagerlie on 03 March 2004 at 04:51 PM.] [This message was edited by Jay Fagerlie on 03 March 2004 at 04:53 PM.] |
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Kevin Mincke
From:
Farmington, MN (Twin Cities-South Metro) USA
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Mark Herrick
From:
Bakersfield, CA
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Posted 4 Mar 2004 10:02 am
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Thanks for the replies.
It's not a question of finding a DIRECT replacement tank; that I can do. I would like to know if putting a tank with different input/output impedences into the amp is going to cause any problems with the reverb circuit, etc.
It sounds like Ray is saying that a tank with lesser input/output impedence might be more of a problem than one with greater input/output impedence.
But what would those differences be?
(BTW - Antique Electronics Supply is a great place to buy replacement tanks; very quick shipping.) http://www.tubesandmore.com/ |
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Jay Fagerlie
From:
Lotus, California, USA
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Posted 4 Mar 2004 11:00 am
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Hey Mark, that difference in impedance is neglagible, I'd attribute it to variances in windings on the output coil. The only way to REALLY know is to do a sweep test in circuit and measure the differences....the first pan against the second...again, the differences would be so small, probably inaudible.
I would think that the 3 spring tank would have a more 'diffuse' sound, but by how much I couldn't say.
Jay
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Michael Brebes
From:
Northridge CA
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Posted 5 Mar 2004 7:47 am
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| The impedance difference is negligable, and higher. If it was lower, then you might need to think about it. I would go for the 3 spring because I think they sound better, more diffuse than the 2 spring units. |
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Mark Herrick
From:
Bakersfield, CA
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Posted 5 Mar 2004 10:49 am
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Ordered one yesterday from AES.
Should be here Monday, and we'll see...
Thanks for the replies! |
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