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Building the ultimate NOS DAC using TDA1541A
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Old 7th December 2014, 07:01 PM   #5281
triode_al is offline triode_al  Netherlands
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Quote:
Originally Posted by niamex View Post
Thanks for your suggestions. I will try the STOPPERS but excuse my ignorance I am afraid it will change the value of the I/V res if not big value /in parallel/ ??
Regards,
Ignat
Now I can't calculate: but the influence is beyond the few hundred kHz. There is "nothing" parallel to the I/V. So there is no influence in the "passband", which is audio.
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Old 7th December 2014, 08:15 PM   #5282
Vbenonisen is offline Vbenonisen  Norway
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Hello, triode_al.

I'm planning to compare a Lampizator SRPP-output stage, a D3a output stage and a Kondo-inspired output stage with 6072 tubes. I see that you have something you call a "Kondo post-I/V filter". What is that, and can you please share your experiences regarding tube based output stages for the 1541A?

Kind regards,
Vidar
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Old 7th December 2014, 08:29 PM   #5283
niamex is offline niamex  Bulgaria
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Quote:
Originally Posted by triode_al View Post
Now I can't calculate: but the influence is beyond the few hundred kHz. There is "nothing" parallel to the I/V. So there is no influence in the "passband", which is audio.
Something is wrong /could be my understanding/ - the I/V resistor stays there and the voltage goes straight to the grid of the triode -if he stopper is from the grid to the ground it is in parallel ?? or I am mistaken.
Thanks
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Old 7th December 2014, 08:35 PM   #5284
niamex is offline niamex  Bulgaria
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Quote:
Originally Posted by Vbenonisen View Post
Hello, triode_al.

I'm planning to compare a Lampizator SRPP-output stage, a D3a output stage and a Kondo-inspired output stage with 6072 tubes. I see that you have something you call a "Kondo post-I/V filter". What is that, and can you please share your experiences regarding tube based output stages for the 1541A?

Kind regards,
Vidar
Hi,
Just for your reference - my very simple tube buffer /in my case with Bendix 6385/ - just a principle schematics - to be revised.

Regards,
Ignat
Attached Images
File Type: jpg 6n3p(1 rev.jpg (388.3 KB, 829 views)

Last edited by niamex; 7th December 2014 at 08:38 PM. Reason: PS Sorry , from 2.7 uf cap to the power amp OUT
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Old 8th December 2014, 09:13 AM   #5285
marconi118 is offline marconi118  Germany
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Quote:
Originally Posted by ecdesigns View Post
Hi ceglar





But we could also use passive amplification plus RF filtering based on a step up transformer. Transformer with 1:10 transformation ratio would give us around 4Vpp. Output voltage can be lower in practical circuits due to losses.



Enjoy.

what transformer would you advice for best sound ?

I need a transformer with double secondary to drive directly the power mosfets of a pass F6 amp... could it be feasible?

no need of a fet buffer there? as the impedance of the lateral mosfets is quite high?
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Old 10th December 2014, 03:06 PM   #5286
triode_al is offline triode_al  Netherlands
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Quote:
Originally Posted by Vbenonisen View Post
Hello, triode_al.

I'm planning to compare a Lampizator SRPP-output stage, a D3a output stage and a Kondo-inspired output stage with 6072 tubes. I see that you have something you call a "Kondo post-I/V filter". What is that, and can you please share your experiences regarding tube based output stages for the 1541A?

Kind regards,
Vidar
I attach a design record.
The first stage is called a Kondo stage. The whole filter amplifies: none. Bandpass : around 21 kHz.

Kondo-based.jpeg

albert
Note: This filter derives from the standard Philips concept of the TDA1541 players. It is such that it maximally compensates for the SAA7220/TDA1541 combination that already has a small uplift around 20 kHz to compensate
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Old 10th December 2014, 04:01 PM   #5287
triode_al is offline triode_al  Netherlands
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Quote:
Originally Posted by niamex View Post
Something is wrong /could be my understanding/ - the I/V resistor stays there and the voltage goes straight to the grid of the triode -if he stopper is from the grid to the ground it is in parallel ?? or I am mistaken.
Thanks
My problem of writing took much words.
here is my idea:

Attachment 453163

The Stopper1 prevents extreme HF noise to be propagated in the connected line. I have depicted a coax, which also serves such a purpose. And the drawing suggests not using the shield as interconnect for the earth.
albert
Attached Images
File Type: jpg I:V connection.jpg (77.6 KB, 713 views)
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Pass buffer -->300B SE + DN2540 CCS/Buffer; --> 165GMF in TQWT; working on a HYPEXed sub.
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Old 10th December 2014, 04:08 PM   #5288
niamex is offline niamex  Bulgaria
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Quote:
Originally Posted by triode_al View Post
The Stopper1 prevents extreme HF noise to be propagated in the connected line. I have depicted a coax, which also serves such a purpose. And the drawing suggests not using the shield as interconnect for the earth.
albert
Noted, thanks.
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Old 10th December 2014, 04:16 PM   #5289
QSerraTico_Tico is offline QSerraTico_Tico  Europe
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Quote:
Originally Posted by triode_al View Post
My problem of writing took much words.
here is my idea:

Attachment 453163

The Stopper1 prevents extreme HF noise to be propagated in the connected line. I have depicted a coax, which also serves such a purpose. And the drawing suggests not using the shield as interconnect for the earth.
albert
Invalid Attachment specified. If you followed a valid link, please notify the administrator
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Old 10th December 2014, 04:21 PM   #5290
Vbenonisen is offline Vbenonisen  Norway
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Quote:
I attach a design record.
The first stage is called a Kondo stage. The whole filter amplifies: none. Bandpass : around 21 kHz.
Thank you triode_al for the explanation.
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