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Old 24th January 2012, 08:35 AM   #1
GoranB is offline GoranB  Poland
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Default Pioneer PD-6500 audio output

Hello,
Does anyone know if i could implement a tube output instead of opamps?
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Old 24th January 2012, 10:56 AM   #2
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Yes, it is possible, but what about space (Transformers, capacitors, tubes, sockets, etc), and a high voltage source availability inside the apparatus??
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Old 24th January 2012, 11:01 AM   #3
GoranB is offline GoranB  Poland
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I have some ECC82, ECC83, ECC81 also PCC88, i have socketc for them too, the anode voltage 200-250V. Space wont be a problem as I can build a PSU in a separated box.
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Old 24th January 2012, 11:18 AM   #4
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Quote:
Originally Posted by GoranB View Post
I have some ECC82, ECC83, ECC81 also PCC88,
None of the tubes above mentioned is a power stage, they can work as headphone drivers, but no loudspeakers. Think n a triode-pentode like ECL82/85 for a 3-5W audio output. And 200V DC 100Ma for stereo, and 6.3V 2Amper for heaters.
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Old 24th January 2012, 01:16 PM   #5
GoranB is offline GoranB  Poland
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Quote:
Originally Posted by Osvaldo de Banfield View Post
None of the tubes above mentioned is a power stage, they can work as headphone drivers, but no loudspeakers. Think n a triode-pentode like ECL82/85 for a 3-5W audio output. And 200V DC 100Ma for stereo, and 6.3V 2Amper for heaters.
Well, maybe my english is a problem here to describe what i need. I dont need a power amp, but schematic for audio circuit based on tubes which will replace the opamps based audio analog circuit in this player.
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Old 24th January 2012, 04:57 PM   #6
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The dac is differential output, but it is voltage output, so you simply need a differential input tube stage that is fairly low gain. Alternatively, you could use the dac's voltage outs to drive a transformer, then feeding a single ended tube stage.
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Old 25th January 2012, 04:53 AM   #7
GoranB is offline GoranB  Poland
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Quote:
Originally Posted by stephensank View Post
The dac is differential output, but it is voltage output, so you simply need a differential input tube stage that is fairly low gain. Alternatively, you could use the dac's voltage outs to drive a transformer, then feeding a single ended tube stage.
Thanks for the reply Stephensank

Yes, its differential, probably it means i have to build a differential input stage , then gain stage and in the end the buffer stage. I wonder if there is some tested schematic where all these stages are included. Could you help about this?
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Old 25th January 2012, 10:29 AM   #8
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Having OpAmps inside the DAC, as I/V converters, there is absolutelly no real purpouse to use tubes after that.
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