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    Get 650-625 V at iddle (mains voltage depends). I...

    Get 650-625 V at iddle (mains voltage depends). I don't have a proper load to do a full throttle test for the moment, but I suspect the voltage will slide more than 580-560V when pushed hard. The...
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    The circuit 58688

    The circuit

    58688
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    Thanks.Modified inverter/driver stage on test....

    Thanks.Modified inverter/driver stage on test. Original was an whimpy 12ax7 ltpi with no capability to proper drive 4xkt88. It was replaced with 12at7 dc coupled cathodyne followed by a hefty 12bh7...
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    Thanks. I was thinking aso. The problem are short...

    Thanks. I was thinking aso. The problem are short leads of those resistors. I preferred to do a strong loop around terminals instead to gain a litle bit length to space more. And Yes balance...
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    This is my layout. Those 33k/5w ceramic wirewound...

    This is my layout. Those 33k/5w ceramic wirewound resistors hoovering one inch below the driver socket. I intend to dissipate ca. 1.6W on each. Do You think holes around socket will be necessary...
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    Yes, cement wirewound have kind of large ecart of...

    Yes, cement wirewound have kind of large ecart of what is called power derating. Seems it can be used at nominal power till 70C and slide off till max acceptable 150C / 300F ambient when still are...
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    I know the power rating is dependent by ambient...

    I know the power rating is dependent by ambient temperature. Just wonder if a cement one can perform at half of nominal max power into a warm environment as a tube amp chassis is?
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    Thanks. My concern regards to not smoke too much....

    Thanks. My concern regards to not smoke too much. Usualy use to dissipate no more than 25%. Have no experience how hot get if use it at half...
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    Resistor power rating

    Hello. Would be a 5w cement wirewound resistor suitable to be used as plate load which dissipate continuous 2w at iddle, please ? Thanks.
  10. I can say it twice :thumbsup:

    I can say it twice :thumbsup:
  11. The secret to get a strong chassis is to weld the...

    The secret to get a strong chassis is to weld the corners. If you chassis have not welded corners be aware to weld the aluminium thin sheets is pretty triky to get decent result.
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    Thank You guys. Love ya!

    Thank You guys. Love ya!
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    Like that ...? 58387

    Like that ...?

    58387
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    Thanks. Mean a load to discharge the cap ? How...

    Thanks. Mean a load to discharge the cap ? How big, please ? I can change the coupling caps if the order of resistors is relevant. 10M, 1 M, few hundred kilos...? May I use 10M to not load the stages...
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    Channels selector

    Hello. May I ask how to do a switching selector circuit which can switch between channels without any popping noise, please? I intend to use a manual rotary switch to select between channels but have...
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    Good news as Mouser agreed for replace without...

    Good news as Mouser agreed for replace without any comments. Those faulty caps remains at me so I.ll have the opportunity to open it to see what the heck is going inside. No excuses for Kemet as they...
  17. Drilling through and retreated is the first thing...

    Drilling through and retreated is the first thing I.ll try aso. There are big chances the drill to self center inside the standoff at a point if usualy the screw is more light material as bronze ,...
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    Was done from Monday when received the pack . Get...

    Was done from Monday when received the pack . Get No answer.��
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    If take a look at datasheet ,for any producer,...

    If take a look at datasheet ,for any producer, will see they use standard sized shells for diferent capacitors value and voltages. Seems very improbable for a standard shell to fit perfectly all caps...
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    I don't think they are fake. They comes with a...

    I don't think they are fake. They comes with a conformity certificate from Mouser which attest there are original parts. It is very tempting to open one to see what happen inside, but at almost 25$...
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    Capacitors issue ?

    Hello.
    Bought from Mouser 8 pcs. KEMET 470uF/450v. When opened the pack found two of them are shaking and rattling inside the shell. I consider this sort of mechanical problem unacceptable and...
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    Stb sw question

    ..
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    This power stage cannot be pushed into overdrive,...

    This power stage cannot be pushed into overdrive, at least into actual configuration. It is a pretty clean amp. As time did not benefit by a hefty driver is hard to believe the grids can be pushed...
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    And still 12bh7 at 600v, 33k plates/100k load,...

    And still 12bh7 at 600v, 33k plates/100k load, great swing, much better

    57302

    It will take only 5-6 volts aroud on input to get power tubes full drive
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    C'mon... with 15V over 1.5k R cathode meant 10mA...

    C'mon... with 15V over 1.5k R cathode meant 10mA / 2=5mA/ tubeŚ47k=235v + 310on plate=545 V.. I think...almost 600:)...not quiet but close
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    UL yes, like mine. Voltages in the chart attached...

    UL yes, like mine. Voltages in the chart attached for 200w57300
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    I just looking what Marshall did in their 200w...

    I just looking what Marshall did in their 200w heads. 12AU7 driver supplied at 620V with 310V on plates at iddling,biased at 15v around
    57296

    57297
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    Is not 600v on the plate. It will be supplied at...

    Is not 600v on the plate. It will be supplied at 600v , almost same as screens for max excursion. The plates will stay at 240v around at idling and max excursion negative peak will be 500V for 0 mA...
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