Welcome! Need support, you got it. Or share your ideas and experiences.
I own these units and have noticed an independent web review shows 0.1-uF 630-volt Tone Factory Vitamin-Q capacitors in use whereas my units have 0.22-uF 630-volt Tone Factory Vitamin-Q capacitors fitted. In the past week, I have rolled (1st roll) to Russian 1988 K42Y-2 0.1-uF 630-volt capacitors and they sound much better. The Tone Factory Vitamin-Q capacitors seem to leak easily with oil present on the outside. What value of capacitance would you recommend? 0.47-uF for the 300B tubes? The Mundorf silver-oil capacitors have me most interested. Opinions/suggestions are much appreciated. TIA!
Edits: 02/10/12Follow Ups:
If you have 0.22 coupling caps in your amp, I will replace the aging caps with 0.22. If you have a bigger budget you should try a pair of vcap. It is no ham to use 0.1 coupling cap.0.22 Vcap is very pricy. Please trust your ear.
I have both 0.1 and 0.22 Vitamin-Q in stock so as 0.1 Vcap.
Thanks for your reply. Would you know the parallel resistor to ground (grid leak resistor) value for the TRV-M300SE power amps? Is it 220-kohm? I want to keep clear of the Tone Factory Vitamin-Q capacitors. As I said, 1 capacitor is leaking and another 2 seem to be on the verge of exhibiting the same phenomena.
The grid leak resistor of M300SE is 120k ohm
Its very much appreciated. It seems the 0.47uF capacitor would be the best value to trial.
I will check the value for you. I guess your amp more than 6 years old.
If you want Vitamin-Q, please let me know
Have you managed to ask Junichi what the load input impedance value is for the TRV-M300SE amps? TIA.
My amps are less than 18 months old purchased new in box. I have also found other minor faults with the power LED's failing and tube sockets needing to be replaced (both Chinese made). In addition, there have also been some wiring faults present.
On a separate note, would you know if its possible to upgrade the AC mains transformers? They look identical to the ones used in the TRK-3488 kit. Any close up photos showing these transformers in further detail would be most helpful. Are they hand wound in China or Japan? Again, I have noticed a wiring fault present between the 2 power amps with a different layout of wiring posts available on the side containing the 4 large holes at the bottom (that is, to the left of the photo I have included).
Where you bought your amp?
All Triode PT and OPT are made in Japan. They are different types of PT.
Thanks for confirming that the AC mains power transformers and speaker output power transformers are all made in Japan. I have found that not all parts used in Triode products are made in Japan. Sure, the majority of the parts used are in fact manufactured in Japan (like Nichicon, Kiwame, Tone Factory, ALPS etc) but other components used are also made in China or Hong Kong (like tube sockets, LEDs, Swellong capacitors etc). Can you suggest any Hashimoto, Tamura or Tango OPT replacements?
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