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Old 17th November 2010, 12:32 PM   #1
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Default Driver Tubes: Help Me Decide

Hi. I wanted to grab a pair of 6SL7 river tubes for my Cary SLA70A Signature amp. I'm currently using a used/tests strong pair of Sylvania VT 229's from the 40's. These tubes are outstanding but slightly forward although I'm willing to buy another pair they are that good. So my narrowed down choices are as folows:

Tesla ECC35 from the 70's- $120 a matched pair.
Tung Sol 6SU7GTY- $95 a matched pair.
Sylvania VT 229- $65 a matched pair.

If you have any experience with these tubes as a driver in a power amp, please let me know your thought. Thanks.
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Old 18th November 2010, 01:06 PM   #2
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No one?
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Old 18th November 2010, 01:11 PM   #3
SY is offline SY  United States
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I've used 6SU7 as an input tube, but if the phase splitter is set up properly, the extra balance it gives (versus 6SL7) is wasted. And as a driver, you'd still need to buffer it from the output stage since the plate resistance is fairly high. It's a good tube regarding linearity, but sheesh, those prices are high.
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Old 18th November 2010, 01:22 PM   #4
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I agree the prices are excessive. You should check out the prices for ECC35's. It's ridiculous.

So since these tubes are for a power amp driver/inverter position, I'm best off saving money and go with the less expensive Sylvania VT 229's?
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Old 18th November 2010, 02:05 PM   #5
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Plain old 6SL7 go for about $15.
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Old 18th November 2010, 03:42 PM   #6
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I just bought 4 RCA cylindrical plate 6SL7s new in the box for $40 on the bay and 4 NIB RCA cylindrical plate 12SL7s for $20. I wouldn't use them (or any other 6SL7) as a driver in a power amp, but for a voltage amp I might find a use for them.
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