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Old 31st December 2003, 12:12 PM   #1
ksd09 is offline ksd09  South Korea
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Arrow EL32 tube

Hi diyer!

I made one amplifier with two EL32s.
but, the sould is OK but, doesn't make me satisfy.
Anybody have amplifier schematic with this tubes?
I have tested with triode mode and pentode mode too.
but, the sound doesn't getting better.

I hope to hear from expert of this tube.

bye
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Old 31st December 2003, 03:56 PM   #2
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I have not come across this tube used in the output of any quality amplifier - I've seen it used as the output in old AC/DC receivers and I believe it was used in car radios also, as the heater current was quite low (200ma).

Its most popular use in the UK was in switching gear in telephone exchanges where its low power consumption and low heat generation enabled large numbers of these tubes to be used in close confinement. I have several of these tubes in their CV and VT equivalents (CV1052 and VT52) all stamped GPO (General Post Office), who used to run our telephone exchanges until the 1980s. It was used in Services equipment also because of its economy in power use.

It is the electrical equivalent of the EL2 - a European side contact tube of the 1930s - as radio designers in the UK generally preferred to use octal types as opposed to the side contact tubes made popular at one time in Europe by Philips and Mullard.
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Old 31st December 2003, 06:08 PM   #3
jacky is offline jacky  Canada
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Default Re: EL32 tube

Really hard to tell what is the problem or it is just the way it is with the EL32 tubes. Would you be able to give more detail (like circuit, bias point, transformer used etc.)? Also what is your reference for good sound or OK sound? Did you compare with other better known tube amp?
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Old 3rd January 2004, 08:39 AM   #4
ksd09 is offline ksd09  South Korea
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I did try it on triode mode.

The sound is good.
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Old 3rd January 2004, 03:47 PM   #5
barossi is offline barossi  Germany
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Default EL32=VT52=CV1052

Hi to all,

i guess that the EL 32 in triode is identical to the famous VT52. (AM i right??) Here you find a lot of schematics:

http://www.bonavolta.ch/hobby/en/audio/vt52.htm

http://vt52.com/diy/diypage/rivers/v...schematic2.jpg

http://vt52.com/diy/myprojects/amps/vt52/vt52.htm

Greetings Hauke
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Old 3rd January 2004, 07:36 PM   #6
jacky is offline jacky  Canada
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Default Re: EL32=VT52=CV1052

Quote:
Originally posted by barossi
Hi to all,

i guess that the EL 32 in triode is identical to the famous VT52. (AM i right??) Here you find a lot of schematics:

http://www.bonavolta.ch/hobby/en/audio/vt52.htm

http://vt52.com/diy/diypage/rivers/v...schematic2.jpg

http://vt52.com/diy/myprojects/amps/vt52/vt52.htm

Greetings Hauke

Definitely not. The Vt-52 in those links is a direct heat triode. EL32 is a pentode.
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Old 3rd January 2004, 07:42 PM   #7
jacky is offline jacky  Canada
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Quote:
Originally posted by ksd09
I did try it on triode mode.

The sound is good.

I thought previously in your first post you said " you have tested with triode mode and pentode mode too but, the sound doesn't getting better. "
What do you mean by "The sound is good?" How does it compare with other tubes?
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Old 3rd January 2004, 09:13 PM   #8
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Hi,

Yes, BUT this EL32 is equivalent to British RAF VT52 not the US army VT52...

The latter is the DHT triode 45....A small 2A3, if you like.

Cheers,
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Old 4th January 2004, 12:30 AM   #9
ksd09 is offline ksd09  South Korea
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I want to hear from your own experiance.
Not just guess as if.

I have change bias and power volts,G2 volts and pre tubes.
I have tested the mode of pentode cause of it's a pentode.
but, when i changed the mode from pentode to triode, it's good ,

Finally, The mode of triode is better than pentode.
and sound good on my bias and pretubes.

Thanks.
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Old 19th September 2011, 02:11 AM   #10
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For an American tube look at a 6Y6G, the VT52 is an octal based 6A3 or a 2A3 with a 6.3V Fi like the 6B4Gl. The 6Y6G which is similar but not the same as the EL32 has a plate voltage of 200V running in pentode Class A and delivers 6 watts, calls for a 2.5K impedance on the OPT so there are some differences but a single ended amp made for an EL32 can be made usable by a 6Y6G and according to what I read an EL-34, but the schematic calls for a 7K primary not 2.5K.

This is where I found it and the 6HS7 is not listed in the GE book, from the schematic it looks like a pentode so maybe it is along the lines of an EF86.
EL32 Single Ended Amplifier D.I.Y

Good Luck,
I am working on a 6Y6 myself.
Thatch
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