Long ago, I built nifty power amps with glass-enclosed vacuum amplifying elements, esp, with motional feedback bridge circuits. So I collected a bunch of output transformers.
Sitting in my parts box for 40 yrs or so is a Partridge output transformer, a magnificent ultra-linear potted unit with all the windings brought out to pins. Seems to be CFB/0/1.7, 60 watts, about 10 lbs (might be Type P4170/1, not certain). I have a bunch of spec sheets and docs from that period and letter from Partidge, 1967. Bought from Harvey Radio in NYC. Incredible square waves pictured in the spec sheet. Needs a good home.
Can anybody tell me if this (once) magnificent unit has much value? Originally sold for $50 which would scale up to thousands today (only kidding).
BTW, I'm glad to scan and eMail the spec sheet pages to anybody interested.
Thanks for any help.
Sitting in my parts box for 40 yrs or so is a Partridge output transformer, a magnificent ultra-linear potted unit with all the windings brought out to pins. Seems to be CFB/0/1.7, 60 watts, about 10 lbs (might be Type P4170/1, not certain). I have a bunch of spec sheets and docs from that period and letter from Partidge, 1967. Bought from Harvey Radio in NYC. Incredible square waves pictured in the spec sheet. Needs a good home.
Can anybody tell me if this (once) magnificent unit has much value? Originally sold for $50 which would scale up to thousands today (only kidding).
BTW, I'm glad to scan and eMail the spec sheet pages to anybody interested.
Thanks for any help.
well according to ebay completed listings, a similar output transformer (not potted) went for 286 pounds in the UK, about $US500. The description was
Partridge Type W WFB
Sought after Partridge Type W WFB/0/1.7ohm. unused judging by the soldered pegs. Top Row AN HT+ HT+ 10-12 kilohms AN
then eight sections -connect in parallel for 1.7ohms. Untested , 14cm high , 12cm wide , 13.5cm deep.
If that's any help...
Partridge Type W WFB
Sought after Partridge Type W WFB/0/1.7ohm. unused judging by the soldered pegs. Top Row AN HT+ HT+ 10-12 kilohms AN
then eight sections -connect in parallel for 1.7ohms. Untested , 14cm high , 12cm wide , 13.5cm deep.
If that's any help...
Wow. Thanks for checking.
Well, they are truly beautiful units and my guess is that there hasn't been as much advance in the state of the transformer art, at least compared to say, capacitors. Likewise, minimal deterioration over time. Or perhaps that's just wishful thinking.
It would be nice to sell among "friends," like here at diyaudio, but hard to beat the opportunities that eBay provides.
i also have a Wharfdale 2-way crossover in a painted wood box, potted in wax, at least as old. Looks like an antique to me. Maybe that is worth big bucks on eBay too!
Are there any hi-fi museums?
Well, they are truly beautiful units and my guess is that there hasn't been as much advance in the state of the transformer art, at least compared to say, capacitors. Likewise, minimal deterioration over time. Or perhaps that's just wishful thinking.
It would be nice to sell among "friends," like here at diyaudio, but hard to beat the opportunities that eBay provides.
i also have a Wharfdale 2-way crossover in a painted wood box, potted in wax, at least as old. Looks like an antique to me. Maybe that is worth big bucks on eBay too!
Are there any hi-fi museums?
Dunno what I was dreaming about, this is not an ultralinear transformer. But it is one of their higher-class units with grain-oriented steel. Those folks sure made fancy units back then. Of course, a British transformer had to be potted against all kinds of tropical weather and insects so it could be used across the empire... back then.
It is made for a 10,000 ohm anode-to-anode load but the primary is brought out to solderable pins as two independent windings for center-tapping
With eight secondary windings coming out to solderable pins independently, you can take one of the windings and make a feedback loop from it - the way Stromberg-Carlson and McIntosh did it. Nice approach.
I put the various spec sheets at:
http://tinyurl.com/othertech
It is made for a 10,000 ohm anode-to-anode load but the primary is brought out to solderable pins as two independent windings for center-tapping
With eight secondary windings coming out to solderable pins independently, you can take one of the windings and make a feedback loop from it - the way Stromberg-Carlson and McIntosh did it. Nice approach.
I put the various spec sheets at:
http://tinyurl.com/othertech
Page 2 appears to be incomplete. Do you mind if I post the pages on my web page? http://www.audiophool.cjb.net/Techno.html
Tom Bavis said:
Sorry for that bug - the full page is now at the site. Thanks for mentioning it.
Yes, I'm sure Partridge would be glad to see their stuff memoriallized. I'll send more Partridge stuff directly to your valuable website by and by.
Found your post while seeking a mate for my Partridge CFB. Maybe 12 years later you still have it?
Sold it on eBay about 5 yrs ago, likely to somebody from east Asia. Hope it doesn't depress you too much, but I got about us$1000, as the original owner and with the original owner's sheets.
B.
B.
bentoronto, do you still have scans of the docs? Are they different from the docs in the links?
https://www.dalmura.com.au/static/Partridge%20datasheets.pdf
https://www.dalmura.com.au/static/Partridge%20info.pdf
Ciao, Tim
https://www.dalmura.com.au/static/Partridge%20datasheets.pdf
https://www.dalmura.com.au/static/Partridge%20info.pdf
Ciao, Tim