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Old 6th December 2010, 10:24 PM   #41
mogliaa is offline mogliaa  United Kingdom
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Hi Thomas, I meant 6n7 as well, hence, my reference to the phase spliter
Cheers
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Old 6th December 2010, 11:58 PM   #42
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Hi!

And you have trouble finding another 6N7? It is a very common tube, almost every tube dealer has them at low prices.

Best regards

Thomas
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Old 7th December 2010, 07:53 AM   #43
mogliaa is offline mogliaa  United Kingdom
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Hi Thomas,
Well, the 6n7gt (specially the blackened one) is not that available, haven't tried the metal version though. Either way, I have 6sl7, 6sn7, 6j5 and 6f8 in stock that I could use, so won't we looking at buying additional valves. I was keen on using the 2,5v triode in order to simplify the filament circuit
Cheers,
Ale
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Old 12th December 2010, 05:24 AM   #44
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Hi Thomas,
How is your 26/45 construction, I'm planning to built 26/45 as well,
would you kind to share a schematic for it, and would be enough gain from 26
to drive 45?

Cheers....
Anton
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Old 12th December 2010, 09:07 AM   #45
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Hi Anton,

I will start construction of the 26/45 amp in January. It is for a customer who ordered such an amp. It will actually have the output tube switchable between 45 and 2A3. Input tube wil be switchable between 26 and 10Y.

Input tube will be transformercoupled with Tango NC20. Outptut transformer is Tango XE20.

Such a configuration will have quite low gain. You need to determine your gain requirements. Depends on the preamp. In my case the amp will be used as a midrange/tweeter amp in a two way active system. Here the amp will drive a horn which has much higher sensitivity than the bass. So this matches well.

You might need to use a step up input transformer to get enough gain. In that case you need to make sure your preamp can drive it.

Best regards

Thomas
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Old 12th December 2010, 09:26 AM   #46
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Hi Thomas,

Thanks FYI.
This is my first time building a tube amp actually,
my plan is the 26/45 to be used as a full-range amp to drive Fostex,
and it will be an integrated amp (no Pre-amp).
Do think I can use such config for Fostex FR speaker?
and how much gain is actually need it?

Cheers....
Anton
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Old 12th December 2010, 09:59 AM   #47
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Hi Anton,

I would not recommend an amp with DHT driver as your first DIY amp. The 26 needs some care to operate hum free.

Also the amp will not have enough gain to be used as an integrated.

Best regards

Thomas
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Old 12th December 2010, 10:33 AM   #48
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Hi Thomas,

Thanks for your explanation, so, I'll have to find replacement driver then.
the reason why I'm building 26/45, because I have those tubes already.

Cheers...
Anton
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Old 13th December 2010, 09:38 AM   #49
garbage is offline garbage  Singapore
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Default not enuff gain

Quote:
Originally Posted by m461c14n View Post
Hi Thomas,

Thanks for your explanation, so, I'll have to find replacement driver then.
the reason why I'm building 26/45, because I have those tubes already.

Cheers...
Anton
Hi Anton

I breadboarded a 26 direct coupled 45 amp. Not enough gain on my Coral Beta 8 (~100db/m). Probably need a 1:4 or greater input transformer. You won't get enough gain with a Fostex.

Click the image to open in full size.

Cheers
Vincent
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Old 13th December 2010, 03:20 PM   #50
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Hi Vincent,

Probably need a 1:10 input transformer.
I guess I have to switch plan then, after seeing what you have built,
I would probably built preamp for my existing #26, and find another input tube for 45 Amp.

Cheers....
Anton
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