THANX DANIEL
Doubtful it was a proto-type, but still likely to be somewhat rare. Philco was still viewed as a quality manufacturer when those were new, but Philco was not very well known in the "Hi=Fi" market.
If you trace the circuit, you should find that the "electro-statics" are directly in the B voltage circuit, often right off the plate of the output tube. They are a high impedance reproducer, so there is little, if any, change in the voltage potentials of the output of the amp circuit.
In their day, the electrostatics were about the best you could have until some of the newer technologies came along with more efficient rivals.
The box itself should be pretty bland too.
Other than testing the tubes in the amp, checking condition of the caps, and replacing those that are not alive anymore, the only way to really find out if the electrostatics work is to make the amp operational and use them. There are people interested in the old "Hi-Fi" gear. It is only remotely possible that there is a schematic available for it.
Unless you can tap a 300 volt or greater "B" voltage audio source, there really is no other way.
: I recently acquired this. I have no idea how it works or how to test it. Was this a proto type?
: speaker cabinet consists of 15" driver, amp (2-6L6's), and two what I was told were "electro static speakers" to act as tweeters?
: Any information on how to test condition, date of manufacture, availability and source of parts, approx. value, etc. WOULD BE HELPFUL
: THANX DANIEL
The Philco SA3000 is in Sam's Photofact #464. Sam's issues numbers in sequence and this one would be around 1960. You may be able to get a copy from your local library or by calling Sam's at 800-428-7267.
Norm
: I am estimating that the age of what you have is probably mid/late fifties, possibly even into 1965. "Blond" plywood cabinet (I am guessing, but that was the prevaling decorative wood shading of that itme period)? With a rather un-assuming grillecloth? 6 inch tapered rectangular legs?
: Doubtful it was a proto-type, but still likely to be somewhat rare. Philco was still viewed as a quality manufacturer when those were new, but Philco was not very well known in the "Hi=Fi" market.
: If you trace the circuit, you should find that the "electro-statics" are directly in the B voltage circuit, often right off the plate of the output tube. They are a high impedance reproducer, so there is little, if any, change in the voltage potentials of the output of the amp circuit.
: In their day, the electrostatics were about the best you could have until some of the newer technologies came along with more efficient rivals.
: The box itself should be pretty bland too.
: Other than testing the tubes in the amp, checking condition of the caps, and replacing those that are not alive anymore, the only way to really find out if the electrostatics work is to make the amp operational and use them. There are people interested in the old "Hi-Fi" gear. It is only remotely possible that there is a schematic available for it.
: Unless you can tap a 300 volt or greater "B" voltage audio source, there really is no other way.
: : I recently acquired this. I have no idea how it works or how to test it. Was this a proto type?
: : speaker cabinet consists of 15" driver, amp (2-6L6's), and two what I was told were "electro static speakers" to act as tweeters?
: : Any information on how to test condition, date of manufacture, availability and source of parts, approx. value, etc. WOULD BE HELPFUL
: : THANX DANIEL