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Tube-Town Forum
Technik
Tech-Talk TT-Projekte
YAH100 bias circuit
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YAH100 bias circuit
2 Antworten
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kentuckytukker
Full Member
92
YAH100 bias circuit
«
am:
16.11.2020 14:27 »
I have recently completed a DR504 clone with use of the TT chassis as offered for the YAH100 clone. The bias PCB is used to provide individual bias adjustment for each EL34 tube. The DR504 has only 2 of these output tubes. No need for matched pairs of these anymore. I slightly changed the assembly of the bias PCB. The 2 pot.meters are soldered at the reverse side and provided with thumbweels. A small hole is now enough to make the neccessary adjustments. It also prevents to enter to deep into the chassis with the screwdriver. Spare holes for unused tube socket locations have been blinded with filler plates. The blue item on the output socket is a varistor. This(these) is added for additional protection on wiring from both output tubes to the OT primary connections
René
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Letzte Änderung: 16.11.2020 14:30 von kentuckytukker
»
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carlitz
YaBB God
1.721
never give up
Re: YAH100 bias circuit
«
Antwort #1 am:
16.11.2020 14:41 »
Hi Rene,
how do you connect the varistor?
Pin 3 - Varistor - GND ?
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kentuckytukker
Full Member
92
Re: YAH100 bias circuit
«
Antwort #2 am:
16.11.2020 15:05 »
Yes, pin 3 to gnd on each tube. I have also added 3 each 300V varistors on the IEC entry socket for additional protection.
mfrgr,
René
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