M2057's, has anyone experimented with these yet????

[rsumperl]

Good afternoon everyone,
So, just purchased eight M2057's for a song and dance. Has anyone experimented with these yet?

Thanks
Ray

 

[smoking-amp]

Same tube as 6LW6. (different heater and base)

 

[Tubelab_com]

You have been talking about building a big amp for some time. Now you have 8 big tubes and a pair of 2200 ohm OPT's, so what's next? These tubes will drop in to Pete Millett's big red board. I have seen that board put out 250 WPC into 2500 ohm OPT's, with 35LR6's (similar), so the only questions left are how much power do you want, and when are you going to build it? 250 WPC comes from 650 volts of B+, lower power requires less voltage.

I have seen some of your text messages on my cell phone, but there is no reliable cell coverage where I currently live, so they appear randomly and often days after they are sent.

 

[blueglow]

Those are highly sought after by the CB radio RF amplifier community (illegal non-fcc approved devices) and typically bring $100 each new. They are a rugged version of the 8950.
Personally, I'd flip them on ebay and buy you two nice 211s or similar if you want to build a big tube audio amp...
Just my $.02 worth

 

[Tubelab_com]

RF amplifier community (illegal non-fcc approved devices)

There might have been 1 or 2 legal (or quasi legal) devices that used 8950's. There were also several ham only sweep tube amps made by Amp Supply Company and others. They all ate tubes with a voracious appetite due to poor design.

Personally, I'd flip them on ebay and buy you two nice 211s or similar

That has been my opinion all along. All true sweep tubes are basically the same. There are a few differences in construction, basing, and pinouts, and of course plate dissipation ratings. There are a few "sweep tubes" that are repined versions of other tubes. The 6BG6 is one example. It is a 6L6GA with a plate cap and a different pinout.

Sweep tubes however fall into two very different price / availability categories. Tubes that were never used in an RF amp (CB or ham) = $5 or less, and tubes that were used in a sweep tube RF amplifier and therefore scarce since all the good ones were burned up long ago = $50 and up!

I avoid high $$$ tubes since I am on a fixed income, and there are plenty of cheap sweep tubes out there.

211's would make a nice audio amp for someone with the necessary high voltage experience, and the willingness to spend some $$$ on OPT's. The OP has a pair of 2K ohm P-P OPT's which are not compatible with 211's.

His amp construction experience is unknown, which is why I suggested Pete's big red board. It is an easy build and a 125 WPC version is documented and at least a dozen have been built. The M2057 will drop in and support his OPT's at a 100 WPC power level, but if it was my build, I would flip the M2057's and go for something else in the 35 watt and up plate dissipation range. I have seen 35LR6's crank out 250 WPC in the red board with a 2.5 K OPT on 650 volts. I got a box full at Dayton a few years back for $4 each.