6c33 SET (my next project). Need some feedback

rvrazvan · 16th March 2011, 11:32 AM

I've just completed my first project. A Zen Triode Clone(decware). My goal was to learn a few thing about tube amps in a practical manner so it was basically a scrap build.

The next step is 6c33 SET. They are cheap but powerful military spec triodes. I bought them for ~8 euros. This won't be just a scrap build. I want to build the best amp i can afford.

The opt's will be custom made. -> i need a source of c-cores in europe

Stereo/monoblock -> wich is better?

Schematic -> which is the best one

RR

pieter t · 16th March 2011, 11:49 AM

Hi RR,

Take a look at Romy the Cat's site (goodsoundclub).
He has much experience with the 6C33; you will find his Melquiades amplifier there.
When you have winding possibilities overthere I would be willing to supply you with some HiB c-cores.
Please note: there exists no "best schematic".
Especially with SE amplifiers take the loudspeaker into consideration; it must play well together.

rvrazvan · 16th March 2011, 11:59 AM

hello pieter
For the moment i don't have any good loudspeakers around. Just some sweet tesla speakers wich i use with the Zen. I will go full range i think. But who know...
Can you send me a price list for the c-cores?
Thank you

suntechnik · 16th March 2011, 12:02 PM

imho EL84 or KT88 triode strapped is a much better choice for audio applications. 6C33C suitable for OTL but once OT is involved there is no benefit using it.

Lundahl (SE) makes good trafos. Double U core claims to be the best design for OT permalloy or amorphous. Magnequest (US) had cobalt cores in stock several years ago probably the most rare and exotic ones.

In case Russian tubes seems to be appealing GU72 (ГУ72) is a very good output tetrode for a SET needs B+ at least 650V however.

rvrazvan · 16th March 2011, 12:14 PM

:I have a EL84 trioded allready

. It is sweet. I also have a few 6c33 and a big appeal to build something with them. Lundhal is to expensive

. I just need good cores. There is someone here who can wind the bobins. He is good. Very good. But from what i know he has only EI cores. And i want C-cores. Eventually i will make my own Xfos. But not yet.

The 6c33 might not be the best choice but 20W SE with ~220V ?

It's a muscle car. BIG FAT engine, low milage but great sound !(i hope

)

pieter t · 16th March 2011, 12:18 PM

Quote:

Originally Posted by rvrazvan

hello pieter
For the moment i don't have any good loudspeakers around. Just some sweet tesla speakers wich i use with the Zen. I will go full range i think. But who know...
Can you send me a price list for the c-cores?
Thank you

Do you have an idea what dimensions you would need?
There are different ranges for c-cores; I don't have them all.

pieter t · 16th March 2011, 12:23 PM

Quote:

Originally Posted by suntechnik

imho EL84 or KT88 triode strapped is a much better choice for audio applications. 6C33C suitable for OTL but once OT is involved there is no benefit using it.

Simply not true; mighty fine output transformer coupled amplifiers are made with the 6C33.

rvrazvan · 16th March 2011, 12:47 PM

Can you provide me some data about them . so i can compute the area that i need.
For an E+I transformer the area must be around 20cm2. so i think i need something like 15cm2 with c cores

pieter t · 16th March 2011, 02:43 PM

Quote:

Originally Posted by rvrazvan

Can you provide me some data about them . so i can compute the area that i need.

I am sorry but you can find the data on c-cores yourself on the www.
Look for the SM, SE, SG and SU series.

rvrazvan · 16th March 2011, 11:41 PM

I'll do that. I don't know yet the notations for cores.
Which schematic?
http://www.goodsoundclub.com/PDF/Melquiades_SET.pdf
or
6c33+cb+se+borely.jpg (image)

16th March 2011, 11:32 AM	#1
rvrazvan diyAudio Member Join Date: Jul 2010	6c33 SET (my next project). Need some feedback I've just completed my first project. A Zen Triode Clone(decware). My goal was to learn a few thing about tube amps in a practical manner so it was basically a scrap build. The next step is 6c33 SET. They are cheap but powerful military spec triodes. I bought them for ~8 euros. This won't be just a scrap build. I want to build the best amp i can afford. The opt's will be custom made. -> i need a source of c-cores in europe Stereo/monoblock -> wich is better? Schematic -> which is the best one RR

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16th March 2011, 11:49 AM	#2
pieter t diyAudio Member Join Date: Apr 2009	Hi RR, Take a look at Romy the Cat's site (goodsoundclub). He has much experience with the 6C33; you will find his Melquiades amplifier there. When you have winding possibilities overthere I would be willing to supply you with some HiB c-cores. Please note: there exists no "best schematic". Especially with SE amplifiers take the loudspeaker into consideration; it must play well together.

16th March 2011, 11:59 AM	#3
rvrazvan diyAudio Member Join Date: Jul 2010	hello pieter For the moment i don't have any good loudspeakers around. Just some sweet tesla speakers wich i use with the Zen. I will go full range i think. But who know... Can you send me a price list for the c-cores? Thank you

16th March 2011, 12:02 PM	#4
suntechnik diyAudio Member Join Date: Jun 2010 Location: St. Petersburg	imho EL84 or KT88 triode strapped is a much better choice for audio applications. 6C33C suitable for OTL but once OT is involved there is no benefit using it. Lundahl (SE) makes good trafos. Double U core claims to be the best design for OT permalloy or amorphous. Magnequest (US) had cobalt cores in stock several years ago probably the most rare and exotic ones. In case Russian tubes seems to be appealing GU72 (ГУ72) is a very good output tetrode for a SET needs B+ at least 650V however.

16th March 2011, 12:14 PM	#5
rvrazvan diyAudio Member Join Date: Jul 2010	:I have a EL84 trioded allready . It is sweet. I also have a few 6c33 and a big appeal to build something with them. Lundhal is to expensive . I just need good cores. There is someone here who can wind the bobins. He is good. Very good. But from what i know he has only EI cores. And i want C-cores. Eventually i will make my own Xfos. But not yet. The 6c33 might not be the best choice but 20W SE with ~220V ? It's a muscle car. BIG FAT engine, low milage but great sound !(i hope )

16th March 2011, 12:47 PM	#8
rvrazvan diyAudio Member Join Date: Jul 2010	Can you provide me some data about them . so i can compute the area that i need. For an E+I transformer the area must be around 20cm2. so i think i need something like 15cm2 with c cores

16th March 2011, 11:41 PM	#10
rvrazvan diyAudio Member Join Date: Jul 2010	I'll do that. I don't know yet the notations for cores. Which schematic? http://www.goodsoundclub.com/PDF/Melquiades_SET.pdf or 6c33+cb+se+borely.jpg (image)

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