Wanted! single-ended 807 schematic

[807tubenut]

Found a nice little 10w output tranny digging in my work shop Friday, Got my gears going to make a single 807 amp for my jukebox, It's built in amp was "misplaced" a few years back.




Thanks!

[hansel67]

What aboutthis one.

Very good and simple.
I use this amp for years.

Triode Dick's Page

Projects/807SE

All the best,
Hans

[llwhtt]

Gordon Rankin did an SE807 design article back in the 90s for Sound Practice magazine. If you google you can find all of the Sound Practice magazines.

Craig

[AmadeusMozart]

Originally Posted by 807tubenut

Found a nice little 10w output tranny digging in my work shop Friday, Got my gears going to make a single 807 amp for my jukebox, It's built in amp was "misplaced" a few years back.




Thanks!

Take a look at Alex Kitic's RH807. I am in the middle of a rebuild with 6L6GC, only change I would advice is to use a stabilised voltage for g2 since his solution is adviced against in one of the tube manufacturer's literature. His RH84 is well regarded and has been built multiple times.

Depending on your listening preferences you may want to use either a 12AT7 or 12AX7 as driver.

AM

[807tubenut]

Thanks guys!


Love the RH807, one Q, will my speco T-7010's be ok for OPT's?


specs are as follows.

70 volt, 10w

4 and 8 ohm out's

the 10w input is 500ohm

[Arnulf]

Of course not.

[Michael Koster]

Originally Posted by 807tubenut

Thanks guys!


Love the RH807, one Q, will my speco T-7010's be ok for OPT's?


specs are as follows.

70 volt, 10w

4 and 8 ohm out's

the 10w input is 500ohm

That sounds like a line matching transformer, which for 2 main reasons isn't suitable for a SE OPT for an 807

- not gapped for DC

- 500 ohm impedance on primary is too low, even if you derate to 5W and load the 4 ohm tap with 8 ohms.

Cheers,

michael

PS maybe a 6080 parafeed circuit could use this transformer

[807tubenut]

Any idea what the specs on the RH807 OPT's are? or a location to buy them?

[Wavebourn]

Originally Posted by Michael Koster

PS maybe a 6080 parafeed circuit could use this transformer

Sure. Parafeed cathode follower loaded on CCS would sing nice.

[AmadeusMozart]

Originally Posted by 807tubenut

Thanks guys!


Love the RH807, one Q, will my speco T-7010's be ok for OPT's?


specs are as follows.

70 volt, 10w

4 and 8 ohm out's

the 10w input is 500ohm

5 ~ 6 k primary, 60 mA ~ 80 mA, 7+ watts. I picked the James 6123HS which is overkill but gives flexibility to try out different tubes / configurations if I fancy that at some time in the future. (unlikely).

AM