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Old 1st July 2009, 01:13 AM   #141
Salas is online now Salas  Greece
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Comments are that half of them turned more noisy and microphonic after 100 hours of use, but the good ones remain some of the best 6V6s I have ever heard. Especially for their smooth human tone. Not the most ''monitor'' but very beguiling.
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Old 28th November 2009, 03:09 AM   #142
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Salas, any updates???
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Old 28th November 2009, 03:32 AM   #143
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Updates are that I took out anything CCS from the anode, and the circuit remains with resistors as loads. Constant current or constant voltage proved a non needed additive in this one, in my system, to my ears.
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Old 28th November 2009, 09:13 AM   #144
Salas is online now Salas  Greece
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Was asked by Tubo to post the buffer unity gain cathode follower way for those who don't want voltage gain. This one is non phase inverting as you know. The previous one with gain is inverting.
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Old 27th December 2009, 02:08 PM   #145
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hey guys,

im almost ready to build the 6v6 pre.... i was just wondering will the anode loaded 6v6 be ok to be used as a dac output stage? what mods will be needed to achieve it?

i wanted to breadboard the circuit today and i don't have a 5k anode load for the 6v6 will a 5k output tranny work in place of the anode resistor?


this is the tube output stage that i want to replace with the 6v6.


thanks

ivan
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Old 27th December 2009, 04:41 PM   #146
Salas is online now Salas  Greece
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I really don't know the outcome, haven't ever used it as I/V. Should work in principle but its for you to experiment. I know they use a small series resistor, but beyond that...

Regarding the anode load, I parallel 2 10 kOhm 5W. A transformer should work too. Just because it drops the output Z to whatever its ratio, up to 10k trafo can be beneficial for THD. When with a resistor load, more than 5k increases the output impedance enough.
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Old 29th December 2009, 11:13 AM   #147
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hi salas,

the 6v6 anode follower as a dac output stage is a success. i deviated some fromn the schematic.
i took out the 1k resistor and put in a 100k resistor from grid to ground and connected the dac positive and negative outputs from their corresponding capacitors directly to the grid and cathode. it still has no maeda regulator and converted the tube power supply to solid state.

what anode choke be suitable to replace the 5k anode resistor.i know that the 6v6 draws a high current.how do i connect a 5k se opt as an anode load. do i just connect the B+ side and the plate side and leave the secondary alone?

you've created a gem...thanks for sharing your knowledge.


thanks

ivan
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Old 29th December 2009, 11:31 AM   #148
Salas is online now Salas  Greece
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Now you use it with a resistor on anode? What exactly you converted for psu? Is it a regulator?

If you leave the secondary alone there will be no reflected impedance to the primary. You either utilize the secondary for output, or terminate with nominal resistor with lower side grounded and then you got the primary as a choke load, taking output from the anode junction still using a blocking capacitor. In either case you should use as much B+ as the anode voltage you get after the drop for a resistor load.
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Old 29th December 2009, 12:12 PM   #149
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hi salas,

i used solid state rectifier instead of a tube rectifier.i used 5y3gt, 5v4g and 5u4g and i prefer the ss rectifier. ill try to see if the opt as an anode choke will sound better.


thanks
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Old 29th December 2009, 12:18 PM   #150
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In the end try the Maida or a shunt regulator after the rectification. How do you filter the B+ now?
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