6C33C SE-OTL Project

What people are working on at the moment
Post Reply
User avatar
IslandPink
Amstrad Tower of Power
Posts: 10022
Joined: Tue May 29, 2007 7:01 pm
Location: Denbigh, N.Wales

#91 Re: 6C33C SE-OTL Project

Post by IslandPink »

Result !
"Once you find out ... the Circumstances ; then you can go out"
User avatar
pre65
Amstrad Tower of Power
Posts: 20888
Joined: Wed Aug 22, 2007 11:13 pm
Location: North Essex

#92 Re: 6C33C SE-OTL Project

Post by pre65 »

brommermartin wrote: Sat Oct 26, 2019 8:04 pm Oke :wink: I have found A pair of Kemet /Rifa 6800uf 160vdc at a local dump shop for 8 euro a piece :D
Hopefully they sound as good as they look :mrgreen:
If all goes wrong the speakers should be safe !
Image
I may have a few of those in my spares box. :)
The only thing necessary for the triumph of evil is for good men to do nothing.

Edmund Burke

G-Popz THE easy listening connoisseur. (Philip)
brommermartin
User
Posts: 14
Joined: Wed Dec 14, 2016 8:09 am

#93 Re: 6C33C SE-OTL Project

Post by brommermartin »

IslandPink wrote: Sat Oct 26, 2019 10:50 pmResult !
Work in progress :D :D
Image
brommermartin
User
Posts: 14
Joined: Wed Dec 14, 2016 8:09 am

#94 Re: 6C33C SE-OTL Project

Post by brommermartin »

Today i did A test run for two ours on A 16-Ohm dummy load , no smoke or sparks :lol: :lol:
Did some tests with A squaire wave generator and set te feedback resistor at 3k for the moment.
Image
User avatar
Ray P
No idea why I do this anymore
Posts: 6000
Joined: Thu Nov 22, 2007 5:18 pm
Location: Somerset

#95 Re: 6C33C SE-OTL Project

Post by Ray P »

That's very dilligent - I'm not sure many of us would have been able to resist hooking up a test speaker by now.
Sorry, I couldn't resist!
brommermartin
User
Posts: 14
Joined: Wed Dec 14, 2016 8:09 am

#96 Re: 6C33C SE-OTL Project

Post by brommermartin »

Have listened for one hour and this amp has great potential :mrgreen: :mrgreen:
All the capacitors are new so no tweaking till is set properly .
With brass instruments it tend to sound a bit grainy, but hopefully it disappears.
I have 6,8uf Obligato oil caps for bypass the output caps evt :roll:
Image
brommermartin
User
Posts: 14
Joined: Wed Dec 14, 2016 8:09 am

#97 Re: 6C33C SE-OTL Project

Post by brommermartin »

Image
User avatar
IslandPink
Amstrad Tower of Power
Posts: 10022
Joined: Tue May 29, 2007 7:01 pm
Location: Denbigh, N.Wales

#98 Re: 6C33C SE-OTL Project

Post by IslandPink »

Very nice. Are those AER's in the horns ?
"Once you find out ... the Circumstances ; then you can go out"
Wolfgang
Old Hand
Posts: 229
Joined: Mon May 07, 2018 3:08 pm

#99 Re: 6C33C SE-OTL Project

Post by Wolfgang »

It's a little early for these kind of recommendations as you have just started putting the basic parts together but the "grainyness" disappears - among other wonderful developments - if you use a Maida regulator for the 6SN7.
brommermartin
User
Posts: 14
Joined: Wed Dec 14, 2016 8:09 am

#100 Re: 6C33C SE-OTL Project

Post by brommermartin »

IslandPink wrote: Mon Nov 04, 2019 9:29 pm Very nice. Are those AER's in the horns ?
Yes :D AER MD1
brommermartin
User
Posts: 14
Joined: Wed Dec 14, 2016 8:09 am

#101 Re: 6C33C SE-OTL Project

Post by brommermartin »

Wolfgang wrote: Mon Nov 04, 2019 10:19 pm It's a little early for these kind of recommendations as you have just started putting the basic parts together but the "grainyness" disappears - among other wonderful developments - if you use a Maida regulator for the 6SN7.
I have the salas shunt regulator ( sshv2 ) in my parts bin :)
User avatar
Ray P
No idea why I do this anymore
Posts: 6000
Joined: Thu Nov 22, 2007 5:18 pm
Location: Somerset

#102 Re: 6C33C SE-OTL Project

Post by Ray P »

brommermartin wrote: Tue Nov 05, 2019 1:08 pm I have the salas shunt regulator ( sshv2 ) in my parts bin :)
Give it a try - will be interesting to get you're view on the result.

I'm resurrecting my own 6C33C project and will use a maida reg on the 6SN7 stage.
Sorry, I couldn't resist!
User avatar
Ray P
No idea why I do this anymore
Posts: 6000
Joined: Thu Nov 22, 2007 5:18 pm
Location: Somerset

#103 Re: 6C33C SE-OTL Project

Post by Ray P »

Wolfgang, have you considered using current sources for the plate loads of the 6SN7 sections?

Ray
Sorry, I couldn't resist!
Wolfgang
Old Hand
Posts: 229
Joined: Mon May 07, 2018 3:08 pm

#104 Re: 6C33C SE-OTL Project

Post by Wolfgang »

Wolfgang, have you considered using current sources for the plate loads of the 6SN7 sections?
I didn't think about this, Ray. What do you have in mind as HV CCS?
User avatar
Ray P
No idea why I do this anymore
Posts: 6000
Joined: Thu Nov 22, 2007 5:18 pm
Location: Somerset

#105 Re: 6C33C SE-OTL Project

Post by Ray P »

Wolfgang wrote: Thu Nov 14, 2019 4:50 am
Wolfgang, have you considered using current sources for the plate loads of the 6SN7 sections?
I didn't think about this, Ray. What do you have in mind as HV CCS?
It was talk about choke loading and the like and I'm aware that K&K Audio have a selection of low-price current source kits and was thinking it might be interesting to try them out. They feature a little down this page;

http://www.kandkaudio.com/other-kits/

I already have the option to use the K&K Audio current sink on the cathode of the output valve.
Sorry, I couldn't resist!
Post Reply