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schematic [message #10931]

Fri, 04 February 2005 17:33

Manualblock
Messages: 4973
Registered: May 2009

Illuminati (13th Degree)

There was an article in AudioeXpress describing a nice 211 SE design with Mercury rec tubes. I have been following the build up of that design and it appears it has reaped quite a reputation. Nothing like the big bore triodes. Anyone have experience with these tubes?

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Re: schematic [message #10932 is a reply to message #10931]

Sat, 05 February 2005 08:20

Wayne Parham
Messages: 18793
Registered: January 2001

Illuminati (33rd Degree)

Maybe that one would be good for a group build?

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Re: schematic [message #10933 is a reply to message #10932]

Sun, 06 February 2005 09:32

Manualblock
Messages: 4973
Registered: May 2009

Illuminati (13th Degree)

It Certainly would make me happy!
However it require's very high plate voltages; difficult to wind transformers and expensive tubes and passive parts. Might not fly with the regular crowd. Unless you are interested???

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Re: schematic [message #10934 is a reply to message #10933]

Sun, 06 February 2005 09:50

Wayne Parham
Messages: 18793
Registered: January 2001

Illuminati (33rd Degree)

How expensive? I mean, we didn't slouch on the power supply transformer for Guinevere, and it wasn't too bad. How much do you think we are talking about for the parts for this mercury rectified SE 2A3?

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Re: schematic [message #10935 is a reply to message #10934]

Sun, 06 February 2005 12:49

Manualblock
Messages: 4973
Registered: May 2009

Illuminati (13th Degree)

Well I would assume the 2a3 trans would be fairly inexpensive but for a 211 with 1100v on the plate might get pricey. The guys who built this went for about 800$ for the handwound power and opt's. Then 866 merc tubes and 211's as well as oil caps etc. the total came in at around 1k.
Then you like real nice chassis so add 150$ to that.

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Re: schematic [message #10936 is a reply to message #10935]

Sun, 06 February 2005 13:44

Wayne Parham
Messages: 18793
Registered: January 2001

Illuminati (33rd Degree)

Gotcha. So about twice the cost of Paramours, yes? I wonder what Heyboer might charge for these transformers. If we're lucky, maybe they already have what we need in their inventory. You think there's any chance of that?

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OPTs [message #10937 is a reply to message #10936]

Sun, 06 February 2005 15:16

Damir
Messages: 1005
Registered: May 2009

Illuminati (2nd Degree)

For 845/211/GM70, etc. project, you can consider the new "Lundahl" LL1688 OPT. From "K&K Audio", price is $275, not too bad.
And for 2A3 & 300B projects, 1664 serie (with 50mA,60mA,80mA,100mA DC current) is nice. They are 3k:8 Ohms only, price is $125.
The only drawback with "Lundahl" OPTs is that they are "naked and ugly" - for under-chasis montage, or buy some separate cover?
I have 1664/80mA OPTs, some experiments are on their way...

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Re: OPTs [message #10938 is a reply to message #10937]

Sun, 06 February 2005 15:30

Wayne Parham
Messages: 18793
Registered: January 2001

Illuminati (33rd Degree)

Not bad at all. What do you think about a PS transformer?

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Re: OPTs [message #10939 is a reply to message #10938]

Mon, 07 February 2005 05:39

Damir
Messages: 1005
Registered: May 2009

Illuminati (2nd Degree)

Huh, I used just Plitron/Amplimo toroids (excellent, but high price) and local custom - made toroids (cheap, but not that good). No experience with other brands, but for the 2A3 project, I`ll work it out somehow (Hammond?)...

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Re: OPTs [message #10940 is a reply to message #10939]

Mon, 07 February 2005 07:15

Manualblock
Messages: 4973
Registered: May 2009

Illuminati (13th Degree)

Superbowl; good game for a change. I can try and post a link to the schematic for the 211 triode amp, it sounds nice with those Lundhal Iron and less expensive than any handwound. I f I could put the 211 amp together that is my dream amp, 20watts of SE triode power.

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