Stay safe and to our WBF members as well
You too, Doc. As we all know, doctors like yourself are our modern day heroes in fighting this pandemic.
Stay safe and to our WBF members as well
Congratulations Phil! That looks like a beauty!
Hi Sam! Miss you neighbor !
Hi,
It is auto bias. I had to verify it at the dealer's by asking them to open up the bottom plate for me to see if there are manual bias pots, and there were none. Also beside each power tube socket is a small red LED indicator. If it lights up, time to change the power tubes, and I was told that even its other partner has to be changed even thought its LED did not light up.
I owned the Defy 7, and yes it did indeed have a circuit board and had to be manually biased in groups of 3 power tubes. A pain to maintain and bias, but sublime sound.Nice point to point wiring . I think the predecessor the DA/Defy 7 had a circuit board but am not sure . Enjoy it in good health Phillip .
IS THE JADIS PA-100 AUTO BIAS OR DO YOU HAVE TP REMOVE THE BOTTOM PLATE TO BIAS TUBES?
Are you sure? The JADIS sales person said you must remove bottom plate like the DA-7 TO BIAS TUBES.
Hi,
It is auto bias. I had to verify it at the dealer's by asking them to open up the bottom plate for me to see if there are manual bias pots, and there were none. Also beside each power tube socket is a small red LED indicator. If it lights up, time to change the power tubes, and I was told that even its other partner has to be changed even thought its LED did not light up.
To me, manual bias means there will be biasing POTS. So you can adjust and set it with a digital voltmeter. The PA100 does not have any pots at all. So it CANNOT be manual. There is nothing for you to calibrate on when you change tubes. Just make sure they are Matched pair or matched sextets, etc. So far, after 3 years, a few fuse snapped and it was like a voltage surge. Change the 160mA fuse and ready to go again. Of course, after 2000 hours, life begins to shorten for the KT88 tubes. That is where I am now.Hi,
Has it been definitive that the bias is automatic? teh site says the bias is manual in capital letters. Also any update how reliable the amplifier has been and how it sounds after awhile?
Please advise. THANKS!
I believe there is a misprint on the manual and all dealers copy it, as Manual. The biasing system is push pull which is the same as my old Jadis JA 200 class A amp, and also the same as the JA120 amp, and the indication of these 2 amps is called Automatic Bias. A clear misprint of the PA100, if you ask me.Any definite answer on the type of bias in the PA 100? On the Jadis web site it says MANUAL ... Would GREATLY appreciate the feedback!
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