Back at the 45 SET - Page 5

mogliaa · 6th December 2010, 09:24 PM

Hi Thomas, I meant 6n7 as well, hence, my reference to the phase spliter
Cheers

Vinylsavor · 6th December 2010, 10:58 PM

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

mogliaa · 7th December 2010, 06:53 AM

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

m461c14n · 12th December 2010, 04:24 AM

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

Vinylsavor · 12th December 2010, 08:07 AM

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

m461c14n · 12th December 2010, 08:26 AM

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

Vinylsavor · 12th December 2010, 08:59 AM

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

m461c14n · 12th December 2010, 09:33 AM

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

garbage · 13th December 2010, 08:38 AM

Quote:

Originally Posted by m461c14n

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.

Cheers
Vincent

m461c14n · 13th December 2010, 02:20 PM

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

6th December 2010, 09:24 PM	#41
mogliaa diyAudio Member Join Date: Dec 2009 Location: London	Hi Thomas, I meant 6n7 as well, hence, my reference to the phase spliter Cheers __________________ "A mistake is always forgivable, rarely excusable and always unacceptable. " (Robert Fripp) http://www.bartola.co.uk/valves/

7th December 2010, 06:53 AM	#43
mogliaa diyAudio Member Join Date: Dec 2009 Location: London	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 __________________ "A mistake is always forgivable, rarely excusable and always unacceptable. " (Robert Fripp) http://www.bartola.co.uk/valves/

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6th December 2010, 10:58 PM	#42
Vinylsavor diyAudio Member Join Date: Feb 2002 Location: Lindau	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

12th December 2010, 04:24 AM	#44
m461c14n diyAudio Member Join Date: Feb 2010 Location: Batavia	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

12th December 2010, 08:07 AM	#45
Vinylsavor diyAudio Member Join Date: Feb 2002 Location: Lindau	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

12th December 2010, 08:26 AM	#46
m461c14n diyAudio Member Join Date: Feb 2010 Location: Batavia	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

12th December 2010, 08:59 AM	#47
Vinylsavor diyAudio Member Join Date: Feb 2002 Location: Lindau	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

12th December 2010, 09:33 AM	#48
m461c14n diyAudio Member Join Date: Feb 2010 Location: Batavia	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

13th December 2010, 02:20 PM	#50
m461c14n diyAudio Member Join Date: Feb 2010 Location: Batavia	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