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Old 16th October 2002, 11:43 AM   #1
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Default SE 6c41c/6s41s amp

Finally completed my tri-channel amp...suitably called frontrow..rugby fans will now what I mean..if not still a meaningfull name puts you on the frontrow of a cinema/concert ;-)

Have listened for 2 evenings now and it ....well... it makes me a proud and happy man..

For details
http://home.zonnet.nl/horneman/6c41c.htm
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Old 16th October 2002, 11:47 AM   #2
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For all the perverts out there that want a peek under her skirt...
I'll indulge you..
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Old 16th October 2002, 09:03 PM   #3
SHiFTY is offline SHiFTY  New Zealand
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Wow! nice work...

Love that wood look, really makes it look old-world...

What are the ratings on those triodes and where do you get them?
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Old 16th October 2002, 09:21 PM   #4
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Default Thanks Shifty!

With a name like frontrow..it had to be a Kiwi to reply first! :-)

I'm originally a South African, now living in Holland, hence my love of rugby...

Back to business.

Here are a couple of links..

http://www.tubes.ru/techinfo/AmateurRadio/6c41c-b.html
http://www.next-power.net/next-tube/Data/6C41C.xls
http://www.jogis-roehrenbude.de/Russian/6C41C.htm
http://www.mclink.it/com/audiomatica/tubes/6c41.htm

and you can get them from KWTUBES on eBay or directly from
http://kwtubes.s5.com/ in Lithuania..From Gintaras Sakenas..great to do business with.. Great contact and speedy handling of order..only drawback (IMHO) is bidpay since there is no paypal in Lithuania yet.

But since you are a Kiwi and first to reply, I'll send you a pair if you mail me your adres...
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Old 17th October 2002, 01:05 AM   #5
Colt45 is offline Colt45  Serbia
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looks pretty neat

the woodwork is great.

sound good??
I had a russian DHT coming a while back, but it broke in the mail
( a couple 807's made it though, ill have to give them a shot.. probably for guitar though).

I've got some 6159's (25v heater version of the 6146 transmitting tube). I think I will try them in AB, if I ever get the iron for it..

nice work!
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Old 17th October 2002, 08:33 AM   #6
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Default Thanks Colt45

Thanks for the compliments...

What DHT did you get? that broke...I have a couple of russian GU 13 that I want to use in a future ..future project... a guitar amp is also a project that I want to do..just for fun...i don't play guitar ...but what the hell

The woodwork is pretty plain..2 boxes with a top...that has a profile routed in...but it turned out quite nice if I may say so myself..

It sounds very good...tremendous detail..nice mid's and high..bass is not super..but can be improved if I bypass the cathode..even then it is not super but that is also limited by my speakers ofcourse (mission761) but i find that that muddles up the mids a little.(cathode bypass that is) .so i've actually left it unbypassed..

...it's the best amp i've ever had/made....I still can't believe I actually built it..and it works? Hum is only audible if I put my ear to within 1meter of a speaker..It worked right "out of the box" so to speak and I had to do no debugging to get it this quiet.. it's choke input and I did not know that choke input could be so quiet..i always thought that it would be noisier...

Good luck with the 6146 project...
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Old 21st October 2002, 08:17 PM   #7
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Default Bas.

Hi South Africa,

Congrats on your amplifier.
Time to debug the residual hum now?
Subjectively cathode bypass caps do slow down transient attacks and dynamics don't they?

Had a look at your site as well,it's cute too!

Rgds,

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Old 22nd October 2002, 07:18 AM   #8
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Hi Frank,

Thanks for the compliment on the website and amp...

What Hum????? ;-)

Last night put up in a 15uF Audyn cap as bypass..so if I understand correctly I'll have everything above around 20Hz fed back..but the treble sounded horrible that way...so I added a 0,056 russian teflon cap...voila...a lot better. Sounds pretty good and I will keep it like this for a while before I start tuning it..

Regards,
Bas
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Old 22nd October 2002, 08:58 AM   #9
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Hi Bas,

Quote:
.Hum is only audible if I put my ear to within 1meter of a speaker..It worked right "out of the box" so to speak and I had to do no debugging to get it this quiet.. it's choke input and I did not know that choke input could be so quiet..i always thought that it would be noisier...
That is what I meant .
Since I have no idea about the efficiency of the Mission 761 I was just wondering if it could still be improved upon.
If it doesn't bother you the better.

See you,
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Old 22nd October 2002, 09:07 AM   #10
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Hi Frank,

I know..but I was just trying to be funny..
The hum is so little that it does not bother me..but I might try in futere one or two things..I am quite limited because of the space I have inside the amp...

Cheers,
Bas
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