Hi-end 845 with only two stage - Page 23

rftelecom · 11th January 2010, 04:54 PM

Quote:

Originally Posted by audiodesign

Massimiliamo would like to know my last version of this amplifier.

I have decided to use the 6HV5A like driver loaded with the last Bartolucci 2:1 interstage transformer.

This combination give estreme performances as sound and measurements.

ok thanks for all!

audiodesign · 23rd January 2010, 06:03 PM

I am near the end with my 813 / GM70 amplifier

813 / GM70 amplifier with Bartolucci transformers

audiodesign · 15th February 2010, 10:24 AM

I have opened a webpage about this project

845 Amplifier with only two stages

Now I am waiting the final version of 2:1 Bartolucci interstage transformers

audiodesign · 15th February 2010, 11:01 AM

For the version 1 I cannot find other choice than this:

M-CAP® Supreme Silver / Gold & Oil 2.2uF 1200V dc

audiodesign · 19th March 2010, 08:50 PM

I have received the last Bartolucci interstage.

Finished all the measurements on both the versions.

845 Amplifier with only two stages

The version 2 have the same frequency band but give a better sound because does not use the interstage capacitor.

In both case the band is limited only by the output transformers.

audiodesign · 30th March 2010, 07:38 AM

Now I am testing the vacuum tube diodes.

4 x GZ34 in diode bridge configuration.

audiodesign · 02:33 PM

Finally arrived all the Bartolucci transformers to complete my 813/GM70 amp

813 / GM70 amplifier with Bartolucci transformers

gaborbela · 24th August 2011, 01:51 AM

Hello

Can I use these interstage transformer to drive my GM70 tube with D3A or with any other tube..
2 X SESCOM MI-13 INTERSTAGE TRANSFORMER | eBay
Unfortunately I can't afford to go with Tango interstage, I live on disability support unfortunately because I had car accident with bike.

I try to find some solution so I can put together my GM70.
Any help, comment welcome!

Greetings gabor

rcavictim · 24th August 2011, 01:56 AM

Quote:

Originally Posted by gaborbela

Hello

Can I use these interstage transformer to drive my GM70 tube with D3A or with any other tube..
2 X SESCOM MI-13 INTERSTAGE TRANSFORMER | eBay
Unfortunately I can't afford to go with Tango interstage, I live on disability support unfortunately because I had car accident with bike.

I try to find some solution so I can put together my GM70.
Any help, comment welcome!

Greetings gabor

I think those would be worth trying if you have them, provided you aren't planning to run the GM70 in A2. With A1 you won't have to worry about DC current in the grid winding.

gaborbela · 24th August 2011, 02:03 AM

Hello
Thank you for your reply!
I do not have them but I can afford these or similar price interstage.
I want to be sure if I invest in them I can use them.
15K:15K a bit to high com pare to the 5K Andrea uses, I don't know.
I'll wait on more opinion. Or may be someone know better solution (what would feet better these amp)
Greetings gabor

1st May 2010, 02:30 PM	#227
audiodesign diyAudio Member Join Date: Sep 2005	Finally arrived all the Bartolucci transformers to complete my 813/GM70 amp 813 / GM70 amplifier with Bartolucci transformers Last edited by audiodesign; 1st May 2010 at 02:33 PM.

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23rd January 2010, 06:03 PM	#222
audiodesign diyAudio Member Join Date: Sep 2005	I am near the end with my 813 / GM70 amplifier 813 / GM70 amplifier with Bartolucci transformers

15th February 2010, 10:24 AM	#223
audiodesign diyAudio Member Join Date: Sep 2005	I have opened a webpage about this project 845 Amplifier with only two stages Now I am waiting the final version of 2:1 Bartolucci interstage transformers

15th February 2010, 11:01 AM	#224
audiodesign diyAudio Member Join Date: Sep 2005	For the version 1 I cannot find other choice than this: M-CAP® Supreme Silver / Gold & Oil 2.2uF 1200V dc

19th March 2010, 08:50 PM	#225
audiodesign diyAudio Member Join Date: Sep 2005	I have received the last Bartolucci interstage. Finished all the measurements on both the versions. 845 Amplifier with only two stages The version 2 have the same frequency band but give a better sound because does not use the interstage capacitor. In both case the band is limited only by the output transformers.

30th March 2010, 07:38 AM	#226
audiodesign diyAudio Member Join Date: Sep 2005	Now I am testing the vacuum tube diodes. 4 x GZ34 in diode bridge configuration.

24th August 2011, 02:03 AM	#230
gaborbela diyAudio Member Join Date: Sep 2005	Hello Thank you for your reply! I do not have them but I can afford these or similar price interstage. I want to be sure if I invest in them I can use them. 15K:15K a bit to high com pare to the 5K Andrea uses, I don't know. I'll wait on more opinion. Or may be someone know better solution (what would feet better these amp) Greetings gabor

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