The 6P3S-"E's are a good replacement for the 6L6GC, and ahould work just fine to replace the 6L6GB as well. I've bought a matched quad, and a matched pair of the 6P3S-E's so far.
Yes.
Why even considering a "close to" product when the real product are available for $28.50 ?
Great tube, and worth every penny if properly matched. Will eat tons of voltage, but keep total dissipation below 24 watts, and they'll last a long time. Ran mine at ~470v B+, class AB, fixed bias. Roughly equivalent to 5881. Sound great triode strapped too.
That is nearly perfect, .35 & .34, I mean that’s good enough for me and if tube balance is close to .000 to .002 that great!
That is a pretty good deal, $28.50 for JJ’s. This company is new to me. Must check it out!
Yup. I got tye same results with a quad of 6P14P-P's too from the same seller. He uses one of those Russian military tube testers that test at high voltage and test pretty much everything. They use punch cards and pegs.
The 7581A is rated 35W anode dissipation. That's more than even the 6L6GC (30W). It might still be possible to use the 6L6GC, but I wouldn't consider the 6P3S-E to be a suitable replacement. To use the 6L6GC, you would first need to be install resistors at the cathodes of the output tubes so idle current can be measured. It's probably low enough to simply plug in the 6L6GC, but you need to be sure. Even after this is confirmed, you need to be aware that the 50W RMS continuous power rating of the Scott might not be possible with the 6L6GC. That doesn't mean the 6L6GC will create any problems, only that the paper rating of the amplifier might be compromised. Considering the fact that real world material consists almost entirely of transient power peaks, this limitation isn't likely to ever create an issue. I followed that approach in replacing the 7581 tubes (not the "A" version) with 6P3S-E in my 40W/ch Citation V. I reduced the idle current to a value more appropriate for the new tubes, and they're working fine.
The sheet for the 6P3S-E is a highly conservative avionics rating. It has no relevance to the tube's capabilities in consumer audio applications. I'm running these tubes at about 470V in my Citation, and others have used them up to at least 500V with no issues.
The one Russian amp I went through for my son had both theb6P3S-E and 5881 listed on its schematic for output tubes. I listened to a couple Dynaco ST-70's in the 1990's that were using 6P3S-E's.
