How much power for a SE 807 amplifier? - Page 3

Brett · 19th October 2003, 01:19 AM

Quote:

Originally posted by Sch3mat1c

I don't recommend using resistors: you loose regulation, and this means the screen voltage will be pulled way south at maximum output. Besides that, any lower screen voltage than as before will require a rebias, and maybe even a different load impedance for maximum power output as well (not like that will make much difference anyway though).

Agreed, and I wouldn't use zeners either. A glow diode with an RC bypass works better and will be quieter.

Original Burnedfingers · 20th October 2003, 11:58 AM

Which would have more power, a SE 807 or a SE EL34?

Joe

MIKET · 20th October 2003, 12:24 PM

According to TDSL in SE mode as a pentode:
11.5 watts for an 807 with 500 V supply and a 6K transformer
11 watts for a EL34 with 250V supply and a 2K transformer

According to TDSL in SE mode as a triode:
807 not listed in this mode of operation.
6 watts for a EL34 with 375V supply and a 3K transformer.

Original Burnedfingers · 15th November 2003, 01:25 PM

My first encounter with the 807 amplifier I purchased left me with a sick feeling in my stomach which resulted in my sending the amplifier back to the manufacturer for repair.

I just received the amplifier back the other day. My first impressions were good until I started to push the little devil.
What had started out to be somewhat sweet sounding turned like a spoiled stepchild. Distortion and a crackling noise resulted from within. At this point in time I was prompted to do a power test to see what I could find out. The results didn't quite live up to the telephone conversation I had with the engineer/builder. I was promised over the phone that the amp was going to deliver 9-10 watts output. I actually got around .7 watt into an 8ohm load.

Having remembered that someone had mentioned that I sue for false advertising I drafted a rather heated email to that effect. I received a reply to pack it up and notify them and they would send a call tag for it.

I think that with the guidance and help here I can build something much better.

Burnedfingers

iklari14 · 15th November 2003, 07:37 PM

Hope this one will help you!
www.diyaudio.8m.com

Regards from Croatia,
Ivo

Original Burnedfingers · 2nd November 2009, 12:24 PM

After letting this amplifier go years ago I have always wondered if I could build a SE amplifier like this one that would be capable of not only more power but maybe a little sweeter sounding. I would like to use a 6SL7 and 6Sn7 and 807 as my tube line up.

Anyone have any ideas?

MIKET · 3rd November 2009, 02:38 AM

Here is an example SRPP45

20th October 2003, 12:24 PM	#23
MIKET diyAudio Member Join Date: Jul 2003 Location: Maine	EL34 vs. 807 According to TDSL in SE mode as a pentode: 11.5 watts for an 807 with 500 V supply and a 6K transformer 11 watts for a EL34 with 250V supply and a 2K transformer According to TDSL in SE mode as a triode: 807 not listed in this mode of operation. 6 watts for a EL34 with 375V supply and a 3K transformer.

15th November 2003, 01:25 PM	#24
Original Burnedfingers diyAudio Member Join Date: Nov 2002	Update My first encounter with the 807 amplifier I purchased left me with a sick feeling in my stomach which resulted in my sending the amplifier back to the manufacturer for repair. I just received the amplifier back the other day. My first impressions were good until I started to push the little devil. What had started out to be somewhat sweet sounding turned like a spoiled stepchild. Distortion and a crackling noise resulted from within. At this point in time I was prompted to do a power test to see what I could find out. The results didn't quite live up to the telephone conversation I had with the engineer/builder. I was promised over the phone that the amp was going to deliver 9-10 watts output. I actually got around .7 watt into an 8ohm load. Having remembered that someone had mentioned that I sue for false advertising I drafted a rather heated email to that effect. I received a reply to pack it up and notify them and they would send a call tag for it. I think that with the guidance and help here I can build something much better. Burnedfingers

15th November 2003, 07:37 PM	#25
iklari14 diyAudio Member Join Date: Mar 2003 Location: Split, Croatia	807 amp Hope this one will help you! www.diyaudio.8m.com Regards from Croatia, Ivo

3rd November 2009, 02:38 AM	#27
MIKET diyAudio Member Join Date: Jul 2003 Location: Maine	I'm liking a 6SL7 SRPP driver for this tube Here is an example SRPP45 __________________ If it has more than three chords, it's jazz. - Lou Reed

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20th October 2003, 11:58 AM	#22
Original Burnedfingers diyAudio Member Join Date: Nov 2002	Which would have more power, a SE 807 or a SE EL34? Joe

2nd November 2009, 12:24 PM	#26
Original Burnedfingers diyAudio Member Join Date: Nov 2002	After letting this amplifier go years ago I have always wondered if I could build a SE amplifier like this one that would be capable of not only more power but maybe a little sweeter sounding. I would like to use a 6SL7 and 6Sn7 and 807 as my tube line up. Anyone have any ideas?

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