update to phillips sepp otl?

AudioGeek · 7th August 2005, 02:09 PM

Here is an attached schematic of an older Phillips SRPP OTL amplifier meant for 800 ohms.

If I substituted 6AS7s or 6C33C's what kind of power output per tube pair is expected?

Is there anything I should be aware of?

Or should I use EL509's?

Finally, do a balanced config to cut out that output coupling cap?

Anyways... its either this or a SE OTL amplifier...

AudioGeek · 7th August 2005, 02:35 PM

check this out:

http://www.super-otl-audio.com/Description.htm

tubetvr · 7th August 2005, 03:23 PM

Hi,

The Philips circuit has a lot of disadvantages; low output power and only class A is possible it is basically just a SRPP.

In my first OTL that I built more than 30 years ago I used that circuit and it works and sound quite good but there are much better circuits available, see here http://www.tubetvr.com/otl.html

Regards Hans

7th August 2005, 02:35 PM	#2
AudioGeek diyAudio Member Join Date: Jan 2004 Location: Minnesota	this is interesting check this out: http://www.super-otl-audio.com/Description.htm __________________ It is not you... you are it.

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7th August 2005, 03:23 PM	#3
tubetvr diyAudio Member Join Date: Jan 2003 Location: Now back in Sweden	Hi, The Philips circuit has a lot of disadvantages; low output power and only class A is possible it is basically just a SRPP. In my first OTL that I built more than 30 years ago I used that circuit and it works and sound quite good but there are much better circuits available, see here http://www.tubetvr.com/otl.html Regards Hans

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