wiring up the power supply....
in this amp i am using a housekeeper transformer,
it functions to control two 12 volt relays,
one relay switches the main transformer to heat up the filaments,
and the other to short our the soft starting resistor supplying
the plate B+ for the 6C33 plates...
a three position switch at front panel is used to sequence these..
there is a dpdt paddle type main switch at the back to remove all ac going inside the box.
in this amp i am using a housekeeper transformer,
it functions to control two 12 volt relays,
one relay switches the main transformer to heat up the filaments,
and the other to short our the soft starting resistor supplying
the plate B+ for the 6C33 plates...
a three position switch at front panel is used to sequence these..
there is a dpdt paddle type main switch at the back to remove all ac going inside the box.
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Hi Tony:
Seeing as the tertiary feedback winding is the same turns as the secondary, is this wound on as bifilar with the secondary?
I've been thinking of a setup where the CFB would be bifilar/matched to the secondary, and a set of taps would be put in the primary plate winding at the same number of turns from the B+ tap. Then a couple of big caps could be put between the CFB ends and the plate taps. That would effectively make twice as much primary winding bifilar coupled to the secondary. Sort of a mini Mac design or Crowhurst Twin Coupled. Since the % CFB would be low (maybe 10%), one might also consider a trifilar UL winding as well (for pentode types). The low %UL and %CFB would be compatible with the TV Sweep tubes, plus allow the typically lower screen Vdc.
Seeing as the tertiary feedback winding is the same turns as the secondary, is this wound on as bifilar with the secondary?
I've been thinking of a setup where the CFB would be bifilar/matched to the secondary, and a set of taps would be put in the primary plate winding at the same number of turns from the B+ tap. Then a couple of big caps could be put between the CFB ends and the plate taps. That would effectively make twice as much primary winding bifilar coupled to the secondary. Sort of a mini Mac design or Crowhurst Twin Coupled. Since the % CFB would be low (maybe 10%), one might also consider a trifilar UL winding as well (for pentode types). The low %UL and %CFB would be compatible with the TV Sweep tubes, plus allow the typically lower screen Vdc.
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yes, smoking-amp, the tertiary winding is bifilar wound and same turns as the secondary...
regarding the trifilar i have seen that in the Alvin Lockhart papers...will do an amp like that in future..
regarding the trifilar i have seen that in the Alvin Lockhart papers...will do an amp like that in future..
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