Marketing just refuses to use the technical term

[old_tv_nut]

Here's a 1956 Crosley ad touting their "Picture Pulse" feature. Sounds like DC restoration to me (or maybe it's only keyed AGC?).

Anybody have a schematic to see if these sets had DC restoration?

[Einar72]

I vote for keyed AGC, since the first two sets are displaying possible AGC-inspired bogeymen...

[cbenham]

Originally Posted by old_tv_nut

Here's a 1956 Crosley ad touting their "Picture Pulse" feature. Sounds like DC restoration to me (or maybe it's only keyed AGC?). Anybody have a schematic to see if these sets had DC restoration?

I found a 21 inch Crosley set in SAMS 317-4 dated 05-1956. The video is DC coupled from the detector diode through the single 12BY7 video amp tube to the cathode of the CRT. I guess this eliminates the need for a DC Restorer.

The brightness control is in the CRT grid 1 circuit where vertical blanking is also inserted.

The set has keyed AGC using a 6AW8 with a local-distance switch.

Cliff

[Username1]

And the 15,000 times a second is also a hint as to what it is....

[old_coot88]

I'd vote for keyed AGC too. But you'd think they coulda at least got the scan rate right instead of "15,000".

[dieseljeep]

Originally Posted by old_coot88

I'd vote for keyed AGC too. But you'd think they coulda at least got the scan rate right instead of "15,000".

That set must've been the TOTL model that year. Even that set was a series-string hot chassis. Most Crosley models were basic, bare-bones designs. Lot of them were one-step above a Muntz.