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Old 9th January 2012, 08:33 PM   #1
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Default My little SE with GU50

This is my little amp with GU50 and 6C3P as driver. Power 5W without any distortion. B+ around 390V, Catode bias with 720Ohm, OT 5200 ohm.
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File Type: jpg GU50 spredaj.jpg (126.0 KB, 849 views)
File Type: jpg IMG_2428.JPG (949.1 KB, 815 views)
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Old 9th January 2012, 08:47 PM   #2
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Looks nice, very original!
Triode mode?
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Old 9th January 2012, 08:55 PM   #3
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Cool looking. What is the chassis? My first thought was a sauce pan.
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Old 9th January 2012, 09:07 PM   #4
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Nice.... is name can be : tondo (roundel)
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Old 10th January 2012, 02:02 AM   #5
Junm is offline Junm  Philippines
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schematics please!
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Old 10th January 2012, 09:39 AM   #6
M Gregg is offline M Gregg  United Kingdom
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Its very nice..

But where is the under shot of the chassis and internals?

Whats the heat transfer between the GU50 and the chassis like? (How hot does it get after an hour?)
What kind of OP Tx have you used and where are they?

Just being nosey..LOL

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M. Gregg
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Last edited by M Gregg; 10th January 2012 at 09:45 AM.
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Old 10th January 2012, 02:27 PM   #7
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Quote:
Originally Posted by Wavebourn View Post
Looks nice, very original!
Triode mode?
Triode mode, I will try pentode too. Wavebourn thx for inspiration (for GU50).
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Old 10th January 2012, 02:32 PM   #8
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Quote:
Originally Posted by M Gregg View Post
Its very nice..

But where is the under shot of the chassis and internals?

Whats the heat transfer between the GU50 and the chassis like? (How hot does it get after an hour?)
What kind of OP Tx have you used and where are they?

Just being nosey..LOL

Regards
M. Gregg
OT are from INDEL (made in Poland) - for EL84, very very cheap. All the material cost around 160 (210$) - I use Silver mica cap 0,1uF for interstage, Jantzen Audio terminals, custom made power transformer, russian Wire wounded cathode resistors for GU50 and 21 step pot (50K log)

see the pictures:
Attached Images
File Type: jpg Od spodaj.jpg (512.1 KB, 660 views)
File Type: jpg GU50 s podnozjem.jpg (219.8 KB, 631 views)
File Type: jpg GU + 6S3P.jpg (193.9 KB, 588 views)
File Type: jpg Detalj podnozje spodaj.jpg (378.2 KB, 305 views)
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Old 10th January 2012, 02:51 PM   #9
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by matejsirk View Post
OT are from INDEL (made in Poland) - for EL84, very very cheap. All the material cost around 160€ (210$) - I use Silver mica cap 0,1uF for interstage, Jantzen Audio terminals, custom made power transformer, russian Wire wounded cathode resistors for GU50 and 21 step pot (50K log)

see the pictures:
Very inventive...

What cable have you used for the volume control? Looks like PTFE sleeve..

I like silver mica caps...Interesting use of the chokes..

Whats the sound like?
Its interesting how you have managed to fit all the components into the round chassis...seems like there should be more components crammed in..LOL

Regards
M. Gregg
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Last edited by M Gregg; 10th January 2012 at 02:54 PM.
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Old 11th January 2012, 12:45 AM   #10
piano3 is offline piano3  United Kingdom
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Are you getting much inductance from those light ballasts?
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