jgazal
500+ Head-Fier
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el34 and 6ca7 are identical items. (...)
Is there any problem using a 6ca7 with beam confining electrode instead of a more traditional suppressor grid?
el34 and 6ca7 are identical items. (...)
Oh there is a TA?
I'd like to share some tidbits from a tube expert on the Hongkong Tube Audio forum about clean power for tube audio gear here. He only uses double shielded industrial power chords with big plugs:
"I ran two dedicated circuits from my distribution box to my AV room. (I put that cable I showed some of you in my roof and wall, so it is getting much-more-correct-than-audiophile-power-cord in my wall at an affordable price.)
One circuit is dedicated to solid state diode power supplies. The other is dedicated to vacuum tube diode power supplies. Never the twain shall meet. There is no chance for switching SS diodes corrupting my tube power supplies this way. The speed matters as well. Tube diodes are fast. SS diodes are slow.
If anything has a switch mode power supply, I run that through an industrial isolation transformer. It's not about making switch mode sound good (iso transformer can help) but more about stopping switch mode from polluting everything else.
Heater technology is one of the most massive advances in vacuum tube hi-fi. The conventional hi-fi world is in the Middle Ages because they have not even conceived of heater technology. Where I have separated my heater power from high tension (separate transformers) I also run separate power cords for heater and high tension. And I group the heaters together (away from high tension power cords) so that they have special handling within my power layout."
I hope this helps ...
Do you have separate transformers from your power company for your "solid state power line" and your "tube power line" too? If not, every glitch, noise burst, and transverse-mode disturbance on your "vacuum tube power line" is present on your "solid state power line," and vise versa. These things propagate at near the speed of light. If your your solid state amp generates some kind of noise or spike, it will travel up your power line to the power company's connection and then back down along your vacuum tube power line and into your vacuum tube amp in less than 0.0000002 seconds. Or in other words, instantly.
I'm having a problem with my 007tII amp, and was wondering if anybody here can help me with it.
The amp is new-ish. I got it directly from Yama's. At random times, one channel - usually the right, but sometimes the left, and never at the same time - will develop a hum. It does it with both my 407 and 009 headphones. (Although it's a higher-end hum with the 009 lol.) It's not just a minor aesthetic issue; it's loud enough to disrupt listening.
I've discovered that I can modify the sound of the hum - make it softer - by resting my hand on the top of the amp. I can make it go away completely by lightly tapping the side of the 007tII's casework. Sometimes it goes away on its own after a few seconds or minutes.
There's a possibly-related second issue. About 20% of the time, upon turn-off, there's a residual hum and/or crackling sound in one channel only (usually the right one) for up to a minute after turn-off. It slowly peters out.
Any ideas?
Doesn't seem to be cables/inputs. I should mention that the hum is sometimes a light crackle, and also that it's a very random thing. 99.9% of the time, everything sounds fine. The gear goes to a dedicated audio outlet that is wired straight back to our fuse box. But our electricity is very strange out here. We live in a town of about 5,000 people, and we are at the very end of the line - the last folks. The lights are forever flickering, dimming, etc. We've had everything checked. It's not the house, it's the "grid", as such. Is STAX electrostatic gear perhaps more sensitive to power irregularities?
Time for a trip to Yama..........
Doesn't seem to be cables/inputs. I should mention that the hum is sometimes a light crackle, and also that it's a very random thing. 99.9% of the time, everything sounds fine. The gear goes to a dedicated audio outlet that is wired straight back to our fuse box. But our electricity is very strange out here. We live in a town of about 5,000 people, and we are at the very end of the line - the last folks. The lights are forever flickering, dimming, etc. We've had everything checked. It's not the house, it's the "grid", as such. Is STAX electrostatic gear perhaps more sensitive to power irregularities?
Time for a trip to Yama..........