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It is currently 18 Feb 2020, 06:04

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PostPosted: 07 Feb 2020, 18:51 

Joined: 07 Feb 2020, 18:29
Posts: 1

I am new to this forum but i am very passionate about audio, especially vacuum tube amplifiers. I own a Decware Taboo MKIII tube headphone amp, connected to a Khadas Tone Board DAC, a USB isolator and to my PC. As headphone i am using the Fostex TH-X00. Currently installed vacuum tubes are rectifier: Svetlana 54ug black plate '50 signal tubes: 2x Hungarian Tungsram EL84 and as input: Siemens silver plate '60 E88CC.

Anyway, when looking for tubes, especially in ebay often in the describtion they put test results of the tube. I just bought 2x Philips SQ E88CC Herleen factory the sellere shared these test results: Tested on ELPO P-508 - Pair = 11/10 + 11/11 mA!

I asked the seller what the measurements mean and his answer was "hese are the currents after measurements, the maximum cathological values ​​are 14 mA, the lamps are not NOS but in a nice condition".

I am wondering do these values have any impact on the sound? I asked the seller and he responded "There is no difference for these tubes ..., e.g. the Soviet equivalent of 6n23p sounds great even at 4-5mA :)"

But i'd like to fact check that.

Can anyone confirm this?

And how do these values concern me as a buyer?

Also i'd like to know how to the Philips compare to the siemens?

My best regards and thanks a lot


PostPosted: 18 Feb 2020, 03:03 

Joined: 23 Feb 2017, 02:02
Posts: 586
Unless the circuit requjres a matched valve, otherwise most circuits don't require matched valves.

A non matched and weak valve with high quality hifi construction will sound better than a non hifi valve perferctly matched.

Also majority of the time you recive the valve and the actuall matching of the valve differs from what buyer specified so is not recomended to chase highly matched valves.
Regardless of the supplyer.

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