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Old 04-05-2007, 02:33 AM
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Charlie Charlie is offline
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Join Date: Aug 2002
Location: Warren, TX
Posts: 2,582
Much better now

Thanks for the good words, guys. I happy with the way things turned out.

As Andy pointed out, tweaking the discriminator reduced the buzz greatly. There is still a little there... probably needs an alignment... but it's a hell of lot better now.

Regarding the sound, my Philco Diamond D hits the bass really well only using one 6x4 speaker and a 6AQ5. Since this Hoffman has two 6BQ5's and two 8" speakers, I was really expecting bass response more like the Philco. Don't misunderstand... the Hoffman sounds really good for a 50's TV. In fact, I can crank the Hoffman's volume control all the way up to the stop... and not one bit of distortion!

John: Yes, the audio is on the TV chassis. I tried the AGC... not much affect there... but good sugestion.

Changing a couple of resistors in the verticle section fixed the occasional roll. I couldn't find the reason for the verticle being steady at the stop of the pot... everything checked well within spec... so I replaced a 1.2 meg resistor off the grid of the oscillator with a 910k resistor... and that put held the picture right in the middle of the control.
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Last edited by Charlie; 04-05-2007 at 02:37 AM.
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