AudioCats's latest activity
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AudioCats replied to the thread Dark Voice 336SE mod thread (external cap-box etc).End result of thsi DV336 #2 (the "switch broken off, for repair" one) front to back: a) volume pot changed to Alps RK27 50K audio...
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AudioCats replied to the thread Any opinions / reviews on Gemtune APPJ PA1502A.sorry, I probably need to clarify: the problem happened when using a separate power supply for the 12v filament power. The amp works...
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AudioCats replied to the thread Any opinions / reviews on Gemtune APPJ PA1502A.test result of using a separated power supply for filament (the on-bard supply only does HV/B+) I was hoping to solve the hum problem...
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AudioCats replied to the thread Any opinions / reviews on Gemtune APPJ PA1502A.AN Niobium, interesting :) ... Partsconnexion doesn't carry them. I might try to find some one of these days. I do not agree with...
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AudioCats replied to the thread Any opinions / reviews on Gemtune APPJ PA1502A.shunt-pot input resistor experiments: (bugle-boy12ax7; 6f6s; 0.44uf FT3 as interstage; 220uf Nichicon ES as cathode bypass; 32 ohm beyer...
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AudioCats replied to the thread Any opinions / reviews on Gemtune APPJ PA1502A.result of my 6v6 cathode caps experiments: (shunt-pot input resistor=audioNote; interstage coupling=FT3 teflon; phones= 32ohm Beyer) a)...
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AudioCats replied to the thread Any opinions / reviews on Gemtune APPJ PA1502A.Partial schematic of PA1502a's power supply. I didn't bother to trace anything related to the power control IC (TOP250YN) since I don't...
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AudioCats replied to the thread Any opinions / reviews on Gemtune APPJ PA1502A.I think appj people put a lot of thoughts into the design, I don't worry about heat problem in this little amp. It was not super warm...
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AudioCats replied to the thread Any opinions / reviews on Gemtune APPJ PA1502A.yeah, the hum I am hearing is likely (mostly) from my capacitor test rig (long wires connecting to header blocks, allowing fast coupling...
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AudioCats replied to the thread Woo Audio WA6-SE - modding to use also as pre amp.I think the WA6 use output transformers, is it possible that WOO utilizes a different tap for the preamp output signal?
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AudioCats replied to the thread Any opinions / reviews on Gemtune APPJ PA1502A.back ground noise / hum: the hum is audiable with my T50rp, but it is very obvious with my 32 ohm Beyer 770. The waveform taken at the...
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AudioCats replied to the thread Any opinions / reviews on Gemtune APPJ PA1502A.thank you very much for your great work, much appreciated. It makes tinkering with this little amp much more fun. :)
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AudioCats reacted to pvico's post in the thread Any opinions / reviews on Gemtune APPJ PA1502A with Like.For those interested, here is the schematic of the amplifier. https://www.dropbox.com/s/ggm7a0la2era3n3/PA1502A APPJ Schematic.png?dl=0...
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AudioCats replied to the thread Any opinions / reviews on Gemtune APPJ PA1502A.I am late to the party. I recently got a used PA1502A, and took it apart for some cleaning and refurbishing. The build quality is very...
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AudioCats replied to the thread Can Little Dot Mk. II be bettered?.DV 336SE has its problems, the most obvious being the hum. It requires some mod to become usable (for me anyway). -- DC filament supply...