• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

My little SE with GU50

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
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.
 

Attachments

  • GU50 spredaj.jpg
    GU50 spredaj.jpg
    126 KB · Views: 1,089
  • IMG_2428.JPG
    IMG_2428.JPG
    949.1 KB · Views: 1,044
Disabled Account
Joined 2010
Its very nice..

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

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
 
Last edited:
Its very nice..

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

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:
 

Attachments

  • Od spodaj.jpg
    Od spodaj.jpg
    512.1 KB · Views: 902
  • GU50 s podnozjem.jpg
    GU50 s podnozjem.jpg
    219.8 KB · Views: 856
  • GU + 6S3P.jpg
    GU + 6S3P.jpg
    193.9 KB · Views: 816
  • Detalj podnozje spodaj.jpg
    Detalj podnozje spodaj.jpg
    378.2 KB · Views: 425
Disabled Account
Joined 2010
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
 
Last edited:
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

The cable is 0.25mm silver in PTFE. The amp sound very good. Better than any EL34 amp I have heard.
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.