sorry for stupid question, but just to make sure,,, can i use tung-sol 6l6g big bottle in my 8200R, without any problems?
https://www.tungsol.com/specs/6l6g-tung-sol.pdf
https://www.tungsol.com/specs/6l6g-tung-sol.pdf
The 12AU7 is a double triode itself, you have 4 triodes in two tubes. What does "matched pair" mean here?
Input attenuators need to be optimized for each source-amp combination. What I see on their side is just technical BS hiding this issue and other nonsense claims. Interestingly, they somehow "forgot" to mention the most important parameter of their product - the load impedance for the source. I would not by a single pack of toothpick from them.
No. My amp is totally silent with no signal at any volume setting. Check your ground path - particularly the solder fillets where the PCBs join at 90 degree angles.
Hi people. I'm new to the forum so first and foremost thanks for having me.
I built the TU-8200R and want to share some of the experiences I made with the combination of TU-8200R and it's headphone out using sensitive IEM or cans (22 Ohm / 55 Ohm), regarding all types of noise. First and foremost: basically all the problems I had (and still have) with any type of noise are to blame on the RCA cables I use in my setup. The setup itself may be a problem also. When I hook my phone to the inputs of the TU using a dongle-DAC and RCA to 3,5 mm jack there is no audible noise at all.
When I use the line out of a 230V powered DAC, it all depends on the RCA cable I use:
T-amp on full gain, Triode mode:
RCA cable 1: DAC/T-amp ON results in high frequent noise. DAC OFF/T-amp ON results in hum. This cable picks up noise like an antenna. 8$ cable off of Amazon.
RCA cable 2: DAC/T-amp ON results in less audible high frequent noise. DAC OFF/T-amp ON results in SILENCE. So slightly better. 10$ cable.
I built the TU-8200R and want to share some of the experiences I made with the combination of TU-8200R and it's headphone out using sensitive IEM or cans (22 Ohm / 55 Ohm), regarding all types of noise. First and foremost: basically all the problems I had (and still have) with any type of noise are to blame on the RCA cables I use in my setup. The setup itself may be a problem also. When I hook my phone to the inputs of the TU using a dongle-DAC and RCA to 3,5 mm jack there is no audible noise at all.
When I use the line out of a 230V powered DAC, it all depends on the RCA cable I use:
T-amp on full gain, Triode mode:
RCA cable 1: DAC/T-amp ON results in high frequent noise. DAC OFF/T-amp ON results in hum. This cable picks up noise like an antenna. 8$ cable off of Amazon.
RCA cable 2: DAC/T-amp ON results in less audible high frequent noise. DAC OFF/T-amp ON results in SILENCE. So slightly better. 10$ cable.
Both, the culprit turned out the extra long RCA cables running from my preamp on the other side of the room. I switched inputs/unplugged it and it went away. I think i’ll need a balanced to unbalanced isolation transformer and run XLR
What causes a ground loop hum?
Ground Loop Hum is caused by a difference in electrical potential at grounding points. ... When you have more than one piece of equipment in your sound system connected to a common ground through different paths, like different outlets on the same circuit, you can get a ground loop.
I had this problem until I put in a ground isolator on the farthest equipment.
Ground Loop Hum is caused by a difference in electrical potential at grounding points. ... When you have more than one piece of equipment in your sound system connected to a common ground through different paths, like different outlets on the same circuit, you can get a ground loop.
I had this problem until I put in a ground isolator on the farthest equipment.
Thanks paczeltf, I did not know that. I ask because at checkout from a shop I noticed the option for getting matched pairs:
I suppose I thought there was one 12AU7 per channel, and that perhaps they had to be sufficiently similar in order for both left and right to sound the same.
Do you mean that this is not a concern and that any two 12AU7 of the same model should be fine?
Just built an Elekit PS-3249R (all the components are soldered using the obvious info in the instructions, and the photograph) for installation in my 8200. Now it's time to set the jumpers (J1-J11). My Japanese is non-existent.
Anyone here have an English instruction translation or a photo of your completed unit that allow the correct jumpers? I plan to use the DAC as designed for the 8200. USB from my Apple laptop, and the external wire to the RCA #2 input.
Anyone here have an English instruction translation or a photo of your completed unit that allow the correct jumpers? I plan to use the DAC as designed for the 8200. USB from my Apple laptop, and the external wire to the RCA #2 input.
It is not clear what they mean by "matched/balanced one tube", but I suspect that the two triodes in the same tube are matched. That does not help that much, because the TU-8200 uses one tube for each channel, so what you would really need is that triode1 from the first tube matches triode1 in the second tube, and triode2 in both tubes are also similar. In my experience the differences in these types of tubes are not very big though.
