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Old 11th October 2012, 10:16 PM   #1
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Default OPTs With Multiple Secondaries

Just found other great Russian tube amp manufacturer:
SPbSound

The output tubes range from 300B, GM70 and even the big 833, the amps sport a nice construction look with fully hand wiring solder and big capacitors.

But what call my attention are his impressive OPTs, which use 2 or 3 secondary windings.
GM70 amp under side photo:
http://spbsound.narod.ru/SPbSound/photo/photo8.html

They even publish a schema:
http://spbsound.narod.ru/SPbSound/sc...hematic10.html

The 833 amp:
http://spbsound.narod.ru/SPbSound/photo/photo5.html


To reduce my ignorance on this subject, I wish ask yours opinions on these OPTs??

Any reason the sound quality could be bad etc ??

Any chance the two secondary windings would substitute a crossover in a two way loudspeaker??
Thanks for your input
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Old 11th October 2012, 10:57 PM   #2
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by FullRangeMan View Post
Any chance the two secondary windings would substitute a crossover in a two way loudspeaker??
Hi,

No, but they might be used to drive each driver in a 2 way separately
e.g. using the low winding for the tweeter instead of attenuation.

Still need crossover components though.

rgds, sreten.
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Old 11th October 2012, 11:05 PM   #3
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OK, Thanks for inform.
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Old 11th October 2012, 11:31 PM   #4
AJT is offline AJT  Philippines
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the HIGH and LOW secondaries can mean that connecting speakers to the LO reflects low impedance to the OPT primary and vice versa, just a guess....
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Old 12th October 2012, 09:46 PM   #5
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Originally Posted by Tony View Post
the HIGH and LOW secondaries can mean that connecting speakers to the LO reflects low impedance to the OPT primary and vice versa, just a guess....
Not sure if I understand all the implications that your ideia present.
I was suppose the Hi & Low secondaries outputs are intend to connect the woofer and the tweeter.
But now Iam in doubt...
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Old 13th October 2012, 12:00 AM   #6
AJT is offline AJT  Philippines
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one thing is for sure, those secondaries present two output levels....high and low, you can connect them in series...
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Old 13th October 2012, 11:20 AM   #7
DF96 is offline DF96  England
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High and Low almost certainly mean high or low impedance matching e.g. 4 or 16 ohms (or 8 and 16). If so, connecting a given speaker load to the Low winding will present a higher impedance to the valve than if you use the High winding.

Wiring the two secondaries in series will give an Extra High connection. Nothing whatsoever to do with crossovers or high and low frequencies.
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