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pwatts So essentially the resistor eats up the current as heat eliminating it being dumped to earth?

I found also with using a voltage stabilizer (the industrial type) to tube gear connected with filter to mains earth leakage. 20ma threshold would very quickly be reached.

Yes, I got surprising results with a Woo Audio WA22 as preamp to the bridged ACA's (V 1.7), the other sources/preamp with less drive the results were lacking a little. So source/pre also important. I am still very temped to do a F5-Turbo (bridged mono really adds to its performance), although...

The ACA in bridged mono is a substantial upgrade in performance to using it in in stereo mode, sure 2 amps are needed and optimally a balanced source. (from balanced input it gives more power and distortion cancellation *)

kolakidd Very nicely done,  I have a 4 tube Aikido I should use just it uses ECC86 tubes. Did you order from Glassware recently? Recall not being sure if he still stocks kit, each time I look most are not available?

HDDC: I was under the impression that a flag or sequence of data in the 16bit is used to toggle dynamic range to 20bit?  Seems only to be padded to 24bit for convenience?

Apart from the evil following of club and DJ remixes, I believe this album should be heard by music listeners of the newer generations. Waiting for Cousteau, the recent Amazonia and for good energy Les concert en Chine is also very enjoyable.

Perhaps increasing input impedance by 10K would help as AR not recommended to drive less than 20Kohm (minimum). Amusing Kinki possibly has 10K input impedance (not 51K)? Just the resistors are fixed. Or perhaps series capacitance of interconnect? (>2000pf)

Regarding background noise. The manual suggests checking for any DC offset on preamp or DAC and especially when using a tube preamp as input is DC coupled. Input impedance may also be determining factor.

There are duds from every stable, but a Renault and a Renault Sport are 2 different cars. Much about where they are built. Regarding dealers, some are classified as "Renault Specialist" dealerships that hopefully had co-tech trained or DP with passion for the brand to service Renault Sport...

If this was a call out fee or pre-negotiated fee it would go down better. Question is does it work at home now? Perhaps if they gave you a USB cable that solved your problem? If not a product they carry, testing it may have had risk, it took some time. If they thought about it, they could have...

seems to be a long life 6SJ7

xumbug Any news on the secret mono's? Hope you have sorted your internet connectivity in the room also? Streaming?

Although this can do differential i2s it still uses USB, a Pi can do i2s directly without the overhead needed for USB processing albeit single-ended, what the Pi2AES does it adds a differential line driver bypassing the  typical limit of 10-20cm distances from the i2s pins. Adding a good...

Late to the party but have a related question. The Earmax/Pro and "clones" also used the 18V AC winding to power 12AT7/ECC81 and 2X6922 heaters in series it amongst other things seems also make life on the tubes short lived. Is it simply because of being run at starving B+?

Be sure to check the videos, I feel the Allo board being quite inefficient (power)  due to high number of regulators and although at CM3 it could be upped with a converter board to CM4 (more CPU power). Regarding power upgrades if the unit already has onboard DC-DC converters and in proximity...

Which USB version does you Spring have? KTE or level 2?

192 and 384Khz have been limits on most single board computers and single-ended i2s output, increasing usually meant patching alsa.

See Gabster's video's below. I reckon the Mercury Streamer from Pi2AES would be better value. Eval unit was $500. https://www.pi2design.com/mercury-streamer.html I have the LifePO4 power supply without superCaps, still going to test to dual-mono Soekris DAM1021. https://youtu.be/jR0VBHwxQ8o...

The pink faun uses a CMI878x driver and it seems to be limited to 192Khz