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Old 24th November 2002, 09:12 PM   #1
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Question ECL 82 low power end tube

Hi everybody,

I want to ask: does anyone know something about the ECL 82 tube? Since a few months I have bought the 'Klein&Hummel Telewatt VS-56' and it sounds very nice, but the output power is on the lower side. Perhaps a matching speaker?

Maarten.
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Old 24th November 2002, 09:40 PM   #2
Fuling is offline Fuling  Sweden
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Gday

ECL 82 is a nice little tube with one input triode and one output pentode in the same "bulb". Maximum plate dissipation for the pentode is about 7 watts if i remember correctly.
Nice tube to build simple amps with, as one tube (per channel)contains "everything" needed for a single ended amp. Puts out somewhere around 3 watts in SE pentode mode.

My first tubeamp employed two PCL 82s (same thing but different filament voltage) with the pentodes wired as triodes.
Quite sweet little bugger...
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Old 24th November 2002, 09:49 PM   #3
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Default K&H

Hi,

You would need speakers in the 94 dB/Watt range at 8 Ohm at least to get some decent output on these.

What exectly would you like to know about the ECL82/6BM8?

Ciao,
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Old 24th November 2002, 10:20 PM   #4
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Default APPLICATION NOTES

Hi,

I came across it accidentally so why not:

ECL82/6BM8

Good news for you is that this valve is still in production and relatively cheap.

Cheers,

P.S.:

K&H
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Old 24th November 2002, 10:40 PM   #5
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Default Re: APPLICATION NOTES

The 6BM8 is a nice little tube -- it has quite a following, particularily in Japan. I am using an SEP 6BM8 in the lab (Calrad) and it does a not bad job of driving my little alnico BK101 hons (90 dB). I also have a couple more that came out of Roberts R-R tape decks. One of these days i'll go over one of them properly and see what i can squeeeze out of them sound-wise.

dave
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Old 25th November 2002, 12:01 AM   #6
Colt45 is offline Colt45  Serbia
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I might try the russian variant 6F3P sometime.

I wish they had a 60v heater though; then you could make a two tube transformerless (less the OPTs) stereo amp..

some kind of little deal..

use input trannies to isolate it.
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Old 25th November 2002, 12:05 AM   #7
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Default 60V HEATER?

Hi,

Why would you need that for and what has it got to do with OTL?

Are you talking heater to cathode insulation voltages?

Puzzled,
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Old 25th November 2002, 12:14 AM   #8
Fuling is offline Fuling  Sweden
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Colt 45:

Try to get some UCL82s . They have 50V filaments. A bit hard to obtain maybe, but should be possible
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Old 25th November 2002, 12:21 AM   #9
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Default UCL82

Hi,

Why not just polarize the upper tube with a part of the anode supply so that you don't exceed heater to cathode insulation ratings?

I see your point but having a 50V heater supply isn't the sollution since these are current driven heaters.

Ciao,
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Old 25th November 2002, 12:22 AM   #10
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Default UCL82

Or maybe not so hard to obtain - 50BM8: $4.00 each at http://www.vacuumtubesinc.com and
http://www.vacuumtubes.com
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