My little SE with GU50

matejsirk · 9th January 2012, 08:33 PM

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.

Wavebourn · 9th January 2012, 08:47 PM

Looks nice, very original!
Triode mode?

HollowState · 9th January 2012, 08:55 PM

Cool looking. What is the chassis? My first thought was a sauce pan.

nicoch58 · 9th January 2012, 09:07 PM

Nice.... is name can be : tondo (roundel)

Junm · 10th January 2012, 02:02 AM

schematics please!

M Gregg · 09:45 AM

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

matejsirk · 10th January 2012, 02:27 PM

Quote:

Originally Posted by Wavebourn

Looks nice, very original!
Triode mode?

Triode mode, I will try pentode too. Wavebourn thx for inspiration (for GU50).

matejsirk · 10th January 2012, 02:32 PM

Quote:

Originally Posted by M Gregg

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:

M Gregg · 02:54 PM

Quote:

Originally Posted by matejsirk

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

piano3 · 11th January 2012, 12:45 AM

Are you getting much inductance from those light ballasts?

9th January 2012, 08:47 PM	#2
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	Looks nice, very original! Triode mode? __________________ If I disappear suddenly, that means I finally created a time machine and pushed wrong button that brought me to Stalin's Russia. In any experiment any result is the result. Even if it is negative.

9th January 2012, 08:55 PM	#3
HollowState diyAudio Member Join Date: Aug 2006 Location: Taxland, New Jersey	Cool looking. What is the chassis? My first thought was a sauce pan. __________________ "The supercomputer is technologically impossible. It would take all of the water that flows over Niagara Falls to cool the heat generated by the number of vacuum tubes required." ~ Professor of Electrical Engineering, New York University

9th January 2012, 09:07 PM	#4
nicoch58 diyAudio Member Join Date: Oct 2004	Nice.... is name can be : tondo (roundel) __________________ Sic58

10th January 2012, 09:39 AM	#6
M Gregg diyAudio Member Join Date: Jun 2010 Location: UK	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 __________________ What is the sound of one hand clapping? Last edited by M Gregg; 10th January 2012 at 09:45 AM.

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10th January 2012, 02:02 AM	#5
Junm diyAudio Member Join Date: Dec 2008 Location: Mabalacat, Pampanga	schematics please!

11th January 2012, 12:45 AM	#10
piano3 diyAudio Member Join Date: Aug 2010 Location: London,UK	Are you getting much inductance from those light ballasts?

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