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Old 17th April 2011, 07:21 PM   #141
yoaudio is offline yoaudio  United States
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Default Tubelab SE with 866A mercury vapor rectifiers.

Found this on on the diytube forum board-- too cool!!!!!!!!


Click the image to open in full size.

Last edited by yoaudio; 17th April 2011 at 07:26 PM.
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Old 17th April 2011, 07:23 PM   #142
weskoki is offline weskoki  Europe
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Let me take my glasses
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Old 18th April 2011, 01:45 AM   #143
wa4swj is offline wa4swj  United States
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Hi Guys,

That's my amp. That picture was taken before I built the base. Here's a link to the finished result:

Click the image to open in full size.

It is a hybrid design - a hand built tubelab SE (no circuit board) and a mercury vapor tube power supply. The OPTs are ElectraPrint. Jack made them for me and they are marvelous. This amp is by far the best one I've built. It's amazing. All the credit goes to George's Power Drive idea. I have it driving a pair of Zaph Audio ZRT's that I built. Wonderful speakers as well. I also have a tubelab SE with George's circuit board that I use in my office. It is a very good sounding amp too.

(Unfortunately I've never been successful linking pictures.)

Best regards,
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Old 18th April 2011, 04:14 PM   #144
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Quote:
Originally Posted by wa4swj View Post
It is a hybrid design
How much hybrid is it? I see twice as many parts in power supply side so I'm wondering...
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Old 18th April 2011, 04:48 PM   #145
wa4swj is offline wa4swj  United States
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Guys,

It's a tubelab SE amplifier with a mercury vapor rectifier power supply instead of the usual power supply as designed in to George's board. I did that just for fun and for something different. From a cost standpoint (it costs a lot more) and probably a performance standpoint it probably doesn't make sense because the power supply probably doesn't have that much effect. But because it looks cool and uses mercury vapor tubes (because I just wanted to use some) I like it and it was a good challenge to do the panel design and build. It certainly sounds better than all my other amps and I have quite a few. Most of the quality of this one is due to George's amplifier design and the OPT's. The amplifier portion is pretty much exactly the same as a tubelab SE. The 417A/300B filaments are DC but use different regulators (2). The power supply is pretty much standard fare for MV tubes. Something similar can be found in Pete Millet's Unnecessarily Complex Amplifier. That was a portion of the inspiration for this amp too.

So it's a mix of a tubelab SE with a much different power supply.

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Old 21st April 2011, 01:23 PM   #146
wagtail is offline wagtail  Ireland
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hi guys,
finished my spp build, sounds great with FH3's.
gonna need help with measurement will post on other thread.
thanks george did what i set out to do ,build a tube amp and learn some on the way.
simon
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Old 21st April 2011, 03:48 PM   #147
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Interesting chassis......Did it start out life as a hot plate or something?
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Old 21st April 2011, 04:49 PM   #148
wagtail is offline wagtail  Ireland
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no, it's bent up from a length of aluminium flat bar with al. angle supporting trannies.
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Old 21st April 2011, 05:41 PM   #149
wagtail is offline wagtail  Ireland
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found an earlier pic. i just used mat'l i had in the workshop,
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Old 24th April 2011, 11:03 AM   #150
Moko is online now Moko  United Kingdom
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Where did you get those transformers they look great? How do they sound?
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