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Old 22nd November 2012, 03:09 AM   #71
tcqanh is offline tcqanh  Viet Nam
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Quote:
Originally Posted by aldovan View Post
No problem.
I working now, but when I arrival in my house, I will post my simple driver solution...not the best, but work fine...

Aldovan
waiting for your schema with 3C24.

some tubes are born to be able to play with pink plate . maybe 3C24 is in that group
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Old 22nd November 2012, 09:16 AM   #72
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3C24 has a shorter lifespan if plate is not operated red.
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Old 22nd November 2012, 09:37 AM   #73
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Originally Posted by ikoflexer View Post
I'd like to see only how you drive the output tubes. I'll play with something like that myself, maybe. There's a lesson to be learned in all of this.
I hope that lesson doesn't include switching to cardboard speakers. I can just feel the bass
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Old 22nd November 2012, 09:42 AM   #74
aldovan is offline aldovan  Brazil
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Originally Posted by MrCurwen View Post
3C24 has a shorter lifespan if plate is not operated red.
Yes, the Eimac and HK recommended use with red plate because the plate work as a "getter" and absorb the oxygen.
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Old 22nd November 2012, 09:47 AM   #75
aldovan is offline aldovan  Brazil
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Originally Posted by Original Burnedfingers View Post
I hope that lesson doesn't include switching to cardboard speakers. I can just feel the bass
No, in the video I play a simple BR with a Utah alnico speaker:
https://www.youtube.com/watch?v=67J3...hannel&list=UL
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Old 22nd November 2012, 09:50 AM   #76
aldovan is offline aldovan  Brazil
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Originally Posted by ikoflexer View Post
I think he was just kidding.

Me like the red plates! Big time!
The 15E play fine, too.
My problem is find the socket...
In the video I use a ceramic bridge for power electric use.
https://www.youtube.com/watch?v=EAR2...feature=relmfu
Sorry for brazilian music....

Aldovan
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Old 22nd November 2012, 02:39 PM   #77
iko is offline iko  Canada
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Quote:
Originally Posted by Original Burnedfingers View Post
I hope that lesson doesn't include switching to cardboard speakers. I can just feel the bass
Good way to prototype, I must say!
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Old 22nd November 2012, 02:41 PM   #78
iko is offline iko  Canada
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Quote:
Originally Posted by aldovan View Post
The 15E play fine, too.
My problem is find the socket...
In the video I use a ceramic bridge for power electric use.
https://www.youtube.com/watch?v=EAR2...feature=relmfu
Sorry for brazilian music....

Aldovan
The 15E seems harder to find. I have a good stash of 4E27, so that's going to be the output tube for me. Problem is... winding my own output transformer.
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Old 22nd November 2012, 02:49 PM   #79
aldovan is offline aldovan  Brazil
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Quote:
Originally Posted by ikoflexer View Post
The 15E seems harder to find. I have a good stash of 4E27, so that's going to be the output tube for me. Problem is... winding my own output transformer.
Why you do not to buy the transformer ?
The Hammond in your country have a line of very good hifi output transformers( but not the 125E or 125SE, please).

Aldovan
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Old 25th November 2012, 06:23 AM   #80
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Quote:
Originally Posted by Original Burnedfingers View Post
Tony,

The point I was trying to make is you cannot tell very much about speaker response the lack of detail or any improvements to a circuit when you listening to speakers mounted in a cardboard box.

Aldovan,

Are you talking this transformer?

GXSE10-8-2.5K


10W, single ended tube output transformer for 2.5K Ohms to 8 Ohms.

I have not used this transformer but I do have on hand two Hammond 125ESE's still new and in the box. If I'm going to build this little amplifier I will not depend on it to try to reproduce low frequencies. I will instead hook up a simple little subwoofer. This is why the Hammond 125ESE transformers I have will work fine. They are somewhat limited in their low frequency response and this will mate up fine with a small subwoofer with the frequency at a maximum of 80-100HZ @ 24db crossover.
I'm not agree about LF of H 125SE. 5-6 years ago seller offered this cheap tr. for SE 2A3, 300B, 6L6...I tried 300B with 125FSE and Freeq. band was more 20-30000 Hz with the sames amplitudes /+- 0 db!/. Now I don't believe that band is 70 or 150 - 15000 Hz . I don't understand seller's deals.....

Last edited by azazello; 25th November 2012 at 06:31 AM.
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