Vanderveen 73 Watt valve amplifier PR20HE-S2 - diyAudio
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Old 28th December 2009, 05:13 AM   #1
Cede is offline Cede  Canada
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Default Vanderveen 73 Watt valve amplifier PR20HE-S2

Hi,

I went across this page from Vanderveen
UL40-S2-Mod

Has anybody tried to build such an amp with 6550 ?

I built a few amps in another life, when I was younger... and now I have a bit more time and money, I'd like to get back to tube amps.

I'm in the period of chossing the design of the amp.
I'm thinking about KT88 PP David Hafler like, but found this pr20he design so simple that it could do the job.

Any advice ?

Regards,
Cedric
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Old 28th December 2009, 05:37 AM   #2
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That is an interesting amp, particularily the way the cathodes are wired up.

I'm no tube guru, but the ECC81 LTP front end is possibly going to need some drive to get the thing to full power (the article says 2V but...) It is similar to the 1st stage of "El Cheapo", which has much easier to drive EL84/6V6/6AQ5. LIKE EL CHEAPO IT COULD LIKELY BENEFIT FROM A CCS ON THE TAIL.

Menno knows his stuff so i'm possibly out to lunch on that. I had the priviledge of meeting Menno, and sat in on a conversation between him and another transformer guru his equal. Most of it was over my head, but it was a heady experience.

Aesthetics are quite nice.
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Old 28th December 2009, 10:38 AM   #3
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EL156 Shugangs oct version; who stocks e'm in Western Europe or US ?

richy
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Old 28th December 2009, 07:00 PM   #4
Cede is offline Cede  Canada
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Thx Planet10.

Menno surely knows his stuff, and his project is of great interest.
Every amp can be tricked to get as close as the sound you like.

About your meeting I know what you're talking about. A friend of my father was working for Jadis and tried to teach me tubes....
Well too far in space for my little teenager head. I learned the hard way by myself, let it go for a good 15 years and now I'm trying to re understand tubes
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Old 24th November 2015, 12:02 PM   #5
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Bump...

Anyone tried or heard this amp?
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Old 24th November 2015, 08:51 PM   #6
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If one were to build this amp what kind of power trans would you need for a stereo version? That is, how much current and voltage would the power trans be able to supply? regards, 808
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Old 24th November 2015, 09:23 PM   #7
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Quote:
Originally Posted by ijscobar View Post
Anyone tried or heard this amp?
Looks good on paper, but... Here is a review from gingertube that might be of interest.
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Old 24th November 2015, 10:59 PM   #8
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Jaz,
Different amp. My review was of the VDV70/100 Amp.
The OP here is talking about the later UL40-S2 Amp or the even later PRH20HE-S2 (according to the thred header) which I think uses an EI core output tranny designed by Menno. I haven't built either of these laater designs.
Bit confused about which he is actually talking about.
Am going to build one of his "Super Triode" designs sometime (Ultralinear + cathode feedback). I have VDV-2100-CFB/H Outpurt Trannies and matching Torroidal Power Tannies on the shelf for a pair of monoblocks. Finding it hard to get enthused for a new build when I am so happy with my 6V6, 6SL7 Baby Hueys.
Cheers,
Ian (Gingertube)

Last edited by gingertube; 24th November 2015 at 11:03 PM.
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Old 25th November 2015, 07:11 AM   #9
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The thread was started in december 2009. I brought it back to life because CeDe asked about the PR20HE and I would like to hear experiences with that specific amp.
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Old 25th November 2015, 07:24 AM   #10
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Quote:
Originally Posted by gingertube View Post
Jaz,
Different amp. My review was of the VDV70/100 Amp.
Sorry about that, I did not read it carefully...

Last edited by jazbo8; 25th November 2015 at 07:28 AM.
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