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Old 22nd August 2009, 07:09 PM   #1
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Default JVC/Delmonico console info

Looking for info on a JVC Delmonico model 317 stereo console. Have found zero info google searching. It sports pp 35c5 amps for 5 watts. Thats pretty much all I've found out so far.
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Old 23rd August 2009, 07:26 AM   #2
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I suppose all I needed to do was look inside for all the info I need. The original schematic was in an envelope glued to the side. Attached is the power amp section. It's pretty standard with the exception of the phase splitter biasing. Another thing I have not seen before is the use of electrostatic tweeters driven directly from the plate of one of the 35c5's.
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Old 23rd August 2009, 04:27 PM   #3
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I'm assuming this thing is power transformerless based on the use of 35C5 output tubes so before you doing anything you should probably find a suitable isolation transformer.

The electrostatic tweeter drive arrangement was quite common in the mid 1960s - Zenith had several mono table radios with a very similar design except for being SE. They sounded considerably better than the run of the mill radio of the time and offered FM as well as AM.

The tweeters are amazingly simple but worked surprisingly well despite the very low polarizing voltage. I'm surprised more people aren't experimenting with similar approaches. You can make them with graphite coated saran wrap, tin foil, a simple miniature wood frame and some perforated AL stock or better steel mesh for the fixed electrode(s). They work - I made a few many years ago. (Powdered graphite aka lock lube is what I used to make the saran wrap modestly conductive.) There are more ambitious projects in old Audio Amateur issues outlining how to build electro-static drivers.

Edit: Thinner films than saran wrap give better HF extension and output. Make sure the film is taught before mounting..
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine

Last edited by kevinkr; 23rd August 2009 at 04:31 PM.
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Old 4th September 2009, 03:36 AM   #4
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I'm going to build a separate amp to drive the tweeters. The transformerless amp will be replaced with SE EL84 amp. Anyone have any ideas for a circuit to drive them or at least some guide lines. After removing the tone control and feedback network they are just slightly louder than the 8"s being driven by 5 watts.

Last edited by jerluwoo; 4th September 2009 at 03:39 AM.
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