On Dec 22, 5:08 pm, Allodoxaphobia config.com> wrote:

A capacitor is an electrical/electronic device that can store energy
in the electric field between a pair of conductors (called "plates").
The process of storing energy in the capacitor is known as "charging",
and involves electric charges of equal magnitude, but opposite
polarity, building up on each plate.

http://electronicstopics.blogspot.com/2008/10/capacitor.html

I'm a little confused again.

Setting up a 1624 tube for cathode biasing and also need to create a
center tap for keying to ground.

The book says 610 ohms at my voltage. So would I use a pair of 1200 ohm
resistors in this case?

My logic is since there is not a separate cathode then the two R in
parallel would raise the filament 'cathode' 600 ohms above B-minus.

TIA and Merry Christmas,

Bill

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Does anyone know the date codes that Mallory uses on their electrolytic
caps a 1900ufd at 450v? Here's a couple of lines..
CGS192T450X5L3PH
235-8112K
Thanks

For my power supply which feeds my Gonset G-76.
Appears that the last owner either removed the plastic pin retainer or
it fell out.
Now, there is nothing to support these female pins from wobbling
around & connector from falling off with poor connections to boot.

The Cinch/Jones model number is S-310-CCT-K
Any help will be apprechiated in getting this rig back on the air.

Need NOT be new.
Regard/73.....
Rich WA2RQY

I built a Class D push-pull CW HF TX with 74HC240s providing
oscillation, buffering, an extra inverter on one side, and two stages
of current amplification, eventually driving a pair of IRF530
MOSFETs..

It looks like I struck a good balance even if there was a phase
offset.

This is what happened.

I turned ann inversting 8-section driver 74HC240 from a single-ended
oscillator->buffer->4Xamp (N7KSB style), into this push-pull monster:

| -inverter-2Xamp-16Xamp-...
VXO-buffer-buffer-|
|-------------2Xamp-16Xamp-...

From VXO to the 2+2 sections in push-pull current amplifier, all fits
into one 74HC240, fed at 5Vdc. Then, in a 8X equivalent fanout, I put
2 x 74HC240 on each side, fed at 8Vdc. 16 sections of current
amplification per side provide A LOT of current, already delivered
over 1W RF, and proved more than sufficient for driving a pair of
IRF530's in push pull with individually trimmed positive DC bias,
probably with room for further expansion.

Still mulling over some RX design changes for a HBR receiver project that I
am considering building. It is going to be an updated version of the HBR
receiver projects that W6TC, Ted Crosby, penned for QST in the late 50s and
early 60s.

I've decided to go with 6EH7 semi-remote pentodes for the RF and IF stages
(overload resistant), meaning my filament current requirements are going out
of sight.. 4.7 amps so far, so I want to cut back on the number of stages.

To cut my tube count and heater energy, I'm looking for opinions on using
6JH8s with self excited injection. The 2nd mixer requires 1515kc injection,
and I'm considering using the 6JH8 as a self-excited crystal oscillator to
eliminate using a separate oscillator stage. Original plan was either a 6BH6
oscillator, or 6U8 combined osc/buffer.

Second branstorm is to use a self-excited 6JH8 for the Product Detector and
85kc BFO, eliminating a separate tube and buffer stage that I had originally
planned on using (another 6U8). Will osc. pulling be a problem? Any other
drawbacks?