I've scored some NOS Pentode tubes; type - 15A6 - which are supposedly the same as types - PL83 and N309. Mine are actually marked as 15A6, with most being of the Haltron brand and the rest are Philips.
These are a video pentode designed for T.v receivers with a very linear set of curves. It has a plate dissipation of 9 watts and of course a 15 volt heater.
I have not found any published push-pull audio specs for these tubes; other than some S.E applications for the N309 by Marconi. I believe the N309 was used also in some 1950's radio recievers as the S.E output tube. I estimate a pair may deliver about 20 watts or so in Class AB or B hopefully with all the benefits of having linear plate curves. Linearity means - Low Distortion - under the the right operating conditions.
Some internet sources also claim the PL83 is a very close replacement for the EL84 ( 6BQ5 ) - though I would not go as far as saying it's a direct equivalent.
I'm interested to know if anyone has used these tubes ( specifically the 15A6 ) in a push-pull amp ( class A, AB or B operation ) and what sort of results they may have attained ? I'm also after some proven circuits for using these in push-pull.
I've attached the specs for those interested. - Thanks.
These are a video pentode designed for T.v receivers with a very linear set of curves. It has a plate dissipation of 9 watts and of course a 15 volt heater.
I have not found any published push-pull audio specs for these tubes; other than some S.E applications for the N309 by Marconi. I believe the N309 was used also in some 1950's radio recievers as the S.E output tube. I estimate a pair may deliver about 20 watts or so in Class AB or B hopefully with all the benefits of having linear plate curves. Linearity means - Low Distortion - under the the right operating conditions.
Some internet sources also claim the PL83 is a very close replacement for the EL84 ( 6BQ5 ) - though I would not go as far as saying it's a direct equivalent.
I'm interested to know if anyone has used these tubes ( specifically the 15A6 ) in a push-pull amp ( class A, AB or B operation ) and what sort of results they may have attained ? I'm also after some proven circuits for using these in push-pull.
I've attached the specs for those interested. - Thanks.
SV83 is equivalent to soviet 6P16P.
PL83 has smaller power rating and essentially smaller gm.
http://www.drtube.com/datasheets/sv83-sed1997.pdf
Tube Tester Files - 6?15? - 6Pi15Pi (SV83)
I have used 6P15P as triode connected SE with higher power output and better linearity than with EL84.
I have no experience with E/PL83.
PL83 has smaller power rating and essentially smaller gm.
http://www.drtube.com/datasheets/sv83-sed1997.pdf
Tube Tester Files - 6?15? - 6Pi15Pi (SV83)
I have used 6P15P as triode connected SE with higher power output and better linearity than with EL84.
I have no experience with E/PL83.
The curves look quite promising both in pentode and triode connection. I'd say that is a go.. 
Unfamiliar type, but I would think any EL84 based designs with some minor tweaks (note the difference in vg) and a maximum plate and screen voltage of 250V would be a good starting point, recalculate the load lines in order to choose the appropriate output transformer.
Unfamiliar type, but I would think any EL84 based designs with some minor tweaks (note the difference in vg) and a maximum plate and screen voltage of 250V would be a good starting point, recalculate the load lines in order to choose the appropriate output transformer.
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