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Old 24th February 2014, 02:14 AM   #1
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Default High Power Valves

Which types of valves are both in the highest watt category and usually in stock at common places?

This would be for a push pull design with a total of two (2) output tubes per channel (i.e. which valves would result in the highest watts as measured by common industry standard... e.g. Low THD @ 20Hz to 20Khz, etc)

What i mean by usually in stock at common places is that they are usually in stock at these two places;

www.thetubestore.com - Your online source for audio vacuum tubes.

https://tubedepot.com/

kind thanks,
Eddie
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Old 24th February 2014, 02:33 AM   #2
kevinkr is offline kevinkr  United States
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Very strange question. The question you should probably be asking provided you have the knowledge and experience to build such an amp is what tube would you use to achieve a target output power at some specified distortion level.

Any specific reason for choosing these two suppliers? I have designed and built a lot of amplifiers over the years and have never bought a single tube from either.

Choose a tube that is either cheap and still readily available such as a tv sweep tube or a tube that is in current production like the 6550, KT88 or EL34..

Low thd and tube amps don't mix in general. For example Tubelab has achieved very high powers (>200W) from single pairs of sweep tubes, but the amplifiers in question were not necessarily intended for long term use. (Exploring what was possible short term.)

So what sort of power are you looking for?
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Old 24th February 2014, 11:01 AM   #3
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Have you considered tubes originally intended for RF use? The 811A is a pretty good candidate (see literature on an Altec 1570B amplifier). These tubes are still in production and fairly cheap at around 25 dollars each. Although neither of the suppliers you listed stocks them. I get my 811s from Home page.
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Old 24th February 2014, 11:12 AM   #4
AJT is offline AJT  Philippines
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4D32, a pair can make 120 watts in push pull
813....
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Old 24th February 2014, 12:59 PM   #5
Ketje is online now Ketje  Belgium
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Quote:
Originally Posted by Eddiegnz1 View Post
Which types of valves are both in the highest watt category and usually in stock at common places?

This would be for a push pull design with a total of two (2) output tubes per channel (i.e. which valves would result in the highest watts as measured by common industry standard... e.g. Low THD @ 20Hz to 20Khz, etc)

What i mean by usually in stock at common places is that they are usually in stock at these two places;

www.thetubestore.com - Your online source for audio vacuum tubes.

https://tubedepot.com/

kind thanks,
Eddie
You want a valve with power try this one (not cheap !)
http://http://www.die-wuestens.de/dindex.htm
Good luck,
Mona
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Old 24th February 2014, 01:13 PM   #6
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Quote:
Originally Posted by AJT View Post
4D32, a pair can make 120 watts in push pull
Soundwave Research: "Bomber Stock" 4D32 tube found in Collins 32V2 Transmitter

Just think of Slim Pickens in "Dr. Strangelove"
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Old 24th February 2014, 01:55 PM   #7
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Quote:
For example Tubelab has achieved very high powers (>200W) from single pairs of sweep tubes, but the amplifiers in question were not necessarily intended for long term use.
I have spent considerable time extracting a lot of power from cheap tubes. Yes I can get 250+ watts from a single pair of TV sweep tubes with respectable THD numbers over the entire audio spectrum for short periods of time.

A typical audio amplifier, even one fed with todays over compressed pop music, or a guitar amp in a live band situation will typically AVERAGE at least 10 dB below full rated power when it is turned up to the point of audible distortion. Thus a 250 watt amp will output 25 watts or less AVERAGE power in audio use. Bob Carver made his carrer on this fact.

I have constructed a 125 WPC stereo amp based on Pete Millett's Engineers Amp. At least 10 have been built from my design and they seem to live just fine in long term use. My amp is still operating with the original tubes in it after 2 years. That amp used 6HJ5's which the tubestore.com lists in stock for $5.95 each! I also like the 6LW6 since it provides about TWICE the power output, but costs more, they are $34.95. Granted these TV tubes are no longer made and some day they will all be gone.

If you choose to use traditional audio tubes there are the new UBER KT88's:

Quote:
With a massive plate dissipation of 70 watts, the Tung-Sol KT150 is the most powerful octal beam tetrode ever produced. A pair of KT150s can allow an amplifier with a power output approaching 300 watts to be built.
This statement is on the tubestore web site and comes from the Tung Sol literature. No one has veified these claims yet, and there is no gurantee that these tubes will see long term production.....$95.95 EACH!
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Old 24th February 2014, 02:50 PM   #8
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As tubelab mentioned, KT120s or KT150s in push-pull would make some big power. Another (cheaper) tube is the Shuguang EL156.

Heck, I've seen EL34 designs that get 100Ws out of a pair. Of course this requires a bunch of voltage and the tubes operating heavily into class B. Run them in parallel to get some more oomph.

And GEC had a design for a 100W KT88 amplifier
http://www.jacmusic.com/KT88/SCHEMATIC5.gif

But if you really need tons of power, I would start to question your speaker choices. I get by with a pair of 60W monoblocks with 89dB speakers. I've never come close to running out of power since this is ear damage territory.
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Old 24th February 2014, 03:05 PM   #9
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Quote:
I get by with a pair of 60W monoblocks with 89dB speakers.
My neighbors like the sound of the 125 WPC amp through 96db speakers with 15 inch woofers
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Old 24th February 2014, 03:18 PM   #10
kuroguy is offline kuroguy  United States
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I'm sure they do. do you go over there with a hammer and re-tighten all the nails in their house on a regular basis?
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