Search found 8862 matches

by Paul Barker
Thu Mar 28, 2024 9:12 am
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 12
Views: 542

Re: GM70 Monoblocks’

Yes the 300b was considered also and the px25. But EL34 is ok at this phase. Then since theres a interstage I considered Sukuma style with GM70 . But this should work. I’ll put the big blue variac we used with the gm70 we tortured at eggborough on Colins inefficient electrostatics. These fifty seven...
by Paul Barker
Thu Mar 28, 2024 6:24 am
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 12
Views: 542

Re: GM70 Monoblocks’

I’m thinking about the driver, and looked at the 45 the px4 aswel as the aforementioned in my first sketch. But I’ve now decided to use the EL34 triode connected. Since the 400v b2 supply coming straight in at that position is perfect for it. It gives the voltage swing I need for full power of the G...
by Paul Barker
Wed Mar 27, 2024 5:20 pm
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 149
Views: 30846

Re: OK…so I’m on wi’ summat

Ah, I didnt know. Luck then they still had a record of my transformer attenuater wiring diagram which I’d misplaced.
by Paul Barker
Wed Mar 27, 2024 4:25 pm
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 149
Views: 30846

Re: OK…so I’m on wi’ summat

Wound components these days are not wound for 243 volts as theyre imported and we said to the rest of europe our voltage is 230. But it isnt. No wound components from cheap sources have any reserves. More true for chokes you want to use as choke input. Mr Senior Sowter is right.
by Paul Barker
Wed Mar 27, 2024 2:36 pm
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 149
Views: 30846

Re: OK…so I’m on wi’ summat

:bounce:
by Paul Barker
Wed Mar 27, 2024 8:02 am
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 149
Views: 30846

Re: OK…so I’m on wi’ summat

Good move Stephen. When I had a 212 amp filling the dining room I could never get rid of a hum. One late night I was listening and with lights off I saw a spark from the potted military choke input choke. It was keeping perfect time with the noise. Obviously it was replaced. Problem solved. Just bec...
by Paul Barker
Tue Mar 26, 2024 9:15 am
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 12
Views: 542

Re: GM70 Monoblocks’

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by Paul Barker
Tue Mar 26, 2024 5:19 am
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 12
Views: 542

Re: GM70 Monoblocks’

by Paul Barker
Mon Mar 25, 2024 12:53 pm
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 12
Views: 542

Re: GM70 Monoblocks’

Ive reworked out the. Distortions. 2nd is correct. 3rd is lower, 0.2%. I wont edit the post above as the thrust is, that in Class A distortion is not an issue.
by Paul Barker
Mon Mar 25, 2024 12:38 pm
Forum: Everyones Projects
Topic: Directly Heated 1619 SET
Replies: 18
Views: 461

Re: Directly Heated 1619 SET

Yes it is so, and no point fighting class A2 using the right valves keep in A1 Ive moved back to the GM70 everyones projects calc’d the distortions into 10k I think the Tributes are set at 10k. And distortion is no longer a tale of woe unless Ive calculated it wrong. I’ll double check that and repos...
by Paul Barker
Mon Mar 25, 2024 12:33 pm
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 12
Views: 542

Re: GM70 Monoblocks’

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by Paul Barker
Mon Mar 25, 2024 11:53 am
Forum: Everyones Projects
Topic: Directly Heated 1619 SET
Replies: 18
Views: 461

Re: Directly Heated 1619 SET

OK so 1619 class A gives out 1 WATT 7.6% 2nd h class A2 was it 5 watt at 5% 2nd h now Ive calculated the 3rd 19.5%. No amount of added 2nd will hide that. So the class A2 1619 is a scrapped project. Enjoying the EL 34 class A I’ll build a GM70 single monoblock next. Again, might not make it A2, pro...
by Paul Barker
Mon Mar 25, 2024 11:48 am
Forum: Everyones Projects
Topic: Directly Heated 1619 SET
Replies: 18
Views: 461

Re: Directly Heated 1619 SET

OK so 1619 class A gives out 1 WATT 7.6% 2nd h class A2 was it 5 watt at 5% 2nd h now Ive calculated the 3rd 19.5%. No amount of added 2nd will hide that.

So the class A2 1619 is a scrapped project.
by Paul Barker
Sun Mar 24, 2024 4:23 pm
Forum: Everyones Projects
Topic: Directly Heated 1619 SET
Replies: 18
Views: 461

Re: Directly Heated 1619 SET

I always saved my wife from their dimensions in the living room. But now Ive got them I realise their worth whereas other electrostats are hard to drive. The 63’s were OK but not as good. A whole group of people did a website that said the dimensions of the 57’s is where the better sound was. So it ...
by Paul Barker
Sun Mar 24, 2024 2:08 pm
Forum: Everyones Projects
Topic: Directly Heated 1619 SET
Replies: 18
Views: 461

Re: Directly Heated 1619 SET

I found the GM 70 build where a choke was involved achording to measurements unnecesary. States “its presence does not influence the measurements at all, but in listening you can clearly hear the difference- it sounds more crisp and clear with the choke.” The 40H choke loads a 5687 cf driver togethe...