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In Reply to: RE: 12BZ7 posted by tz7 on June 10, 2012 at 17:00:55
and did find the Telefunken smooth plate an interesting listen. Mine are totally reworked though. All tantalum resistors, NOS, upgraded caps and I don't use the onboard power supply caps but an array of off board poly and oil caps. I also converted it to balanced input and all wiring is high purity dead soft silver. I also changed the driver tubes over to regulated heaters vs to ac. It is quieter that way but sometimes you get better dynamics with AC heaters.
The Elaborate DAC=Johnny's Balloon Meshplate 27 Balanced Preamp=Balanced Six Pacs=Newform Research 645
iRiver H140/MB Balanced dac/amp/Ultrasone Ed. 9/JH13 Pro IEM's
see images at: www.pbase.com/jamato8
Edits: 06/11/12Follow Ups:
"I also changed the driver tubes over to regulated heaters vs to ac. It is quieter that way but sometimes you get better dynamics with AC heaters."
I am looking at the owners manual for the Cary Audio Six Pac amplifier.
It shows that all the tubes are in-directly heated (meaning that the heater supply is not part of the signal path).
Can you explain how the amplifier can have better (or worse) dynamics depending on how you heat the heaters (as long as they are heated to the correct temp and not adding noise to the audio path)?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
disperses the electrons. I don't know for sure but I have read it often that AC heaters produce better dynamics. I spoke to Dennis once and he felt this, which is why the Six Pac had/has the AC heaters. You could ask Cary I would think.
The Elaborate DAC=Johnny's Balloon Meshplate 27 Balanced Preamp=Balanced Six Pacs=Newform Research 645
iRiver H140/MB Balanced dac/amp/Ultrasone Ed. 9/JH13 Pro IEM's
see images at: www.pbase.com/jamato8
6.3 volts AC RMS is another way to say how much AC voltage is required to get the same amount of heat into the cathode as you would with 6.3 volts DC.RMS, as a way of measuring AC, was invented for that very reason.
A cathode will be heated to the same temp. using 6.3 volts AC RMS as it would for 6.3 volts DC. (BTW, 6.3 volts AC is 17.766 volts peak to peak)
With direct heated tubes (45, 2a3, 300b, etc.) the heater (filament) supply can be part of the signal path and there is good reason to think that the sound might be different between AC and DC heating.
This is where the idea that AC vs. DC makes a difference comes from, but not with in-direct heated tubes.
In-direct heated tubes have no way of telling the difference between AC and DC heating.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 06/11/12 06/11/12
as this is what Dennis mentioned to me as have a few other. I read what you wrote but thee still seems to be a difference of opinion.
The Elaborate DAC=Johnny's Balloon Meshplate 27 Balanced Preamp=Balanced Six Pacs=Newform Research 645
iRiver H140/MB Balanced dac/amp/Ultrasone Ed. 9/JH13 Pro IEM's
see images at: www.pbase.com/jamato8
I gave no opinions. Only facts.
You have been given mis-information.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
that the filament remains more constant with AC. It has been postulated that with DC there is metal migration.
The Elaborate DAC=Johnny's Balloon Meshplate 27 Balanced Preamp=Balanced Six Pacs=Newform Research 645
iRiver H140/MB Balanced dac/amp/Ultrasone Ed. 9/JH13 Pro IEM's
see images at: www.pbase.com/jamato8
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