SOLD - BEST OFFER FOR: Vintage 6V6 GT tubes would trade for EL84 / 12AX7's
Item #649366980Info: Vintage 6V6 GT tubes would trade for EL84 / 12AX7's
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Jan 11, 18 8:14am (PST)
Edited: Jan 19, 18 6:10pm
North York,Toronto, ON
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Many vintage 6V6 GT tubes would trade for EL84 / 12AX7's
Most were never used, some slightly used
All test strong on my B+K tube tester
Brands include Dumont,Electrohome,GE,Marconi,RCA,Rogers,Sylvania,Westinghouse...
I have sold all my 6V6 amps and no longer need these tubes...
Jul 14, 17 10:54am
Also have some pairs of Rogers 6L6 / 6SL7 / 6SN7 tubes
Jul 14, 17 11:34am
Pairs of 6SN7 + 6SL7 tubes:
The 6SL7 could be regarded as the high mu companion to the medium mu 6SN7. Like the 6SN7 it became quite popular during the 1990ies among audio amplifier builders. It went through a similar popularity cycle as the 6SN7. After being overused and often in applications for which it is not well suited, it went a bit of fashion.
It shares the same octal base and pinout with the 6SN7. To some tube rollers this made it seem compatible and it was often tried as an alternative to get more gain. While the 6SL7 might work in some circuits designed for the 6SN7 and provide a bit higher gain, it really is a different animal and should only be used in circuits which are designed for it. The heater operates at the same 6.3V as the 6SN7 but at only half the current (300mA). As mentioned above it is a high mu triode with an amplification factor of 70 vs the 20 of the 6SN7. But that high amplification factor comes at a cost. The 6SL7 has a plate resistance of 44kOhms which is more than 6 times higher than the rp of the 6SN7. It also operates at a lower current, typically around 2ma. For complete technical data please see the data sheet.
This high plate resistance which comes with a rather low transconductance probably is the reason why it lost popularity a bit when higher transconductance tubes became more fashionable. But this does not make it a bad tube. If the circuit is designed for it's parameters it is a great performer and it works well in unison with the 6SN7. For example as first stage in a phono preamplifier. Correctly implemented the 6SL7 gives a nice warm and smooth sound. As it does for example in my Octal Preamplifier Mk1. The 6SL7 has also been used as driver tube for small triodes like the 45 or 71A. With both sections wired in parallel to halve the plate resistance this can work well and offer the possibility to build a simple two stage amplifier. I wouldn't use it for larger triodes though. I prefer it in small signal applications like phono stages. The reason for it's deserved popularity in the 1990ies was it's good linearity:
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