Search found 8866 matches

by Paul Barker
Thu Mar 28, 2024 3:54 pm
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 17
Views: 599

Re: GM70 Monoblocks’

Position of instruments et al is their forte and Im loving it. Diana is aware of hr situation and her demensia isnt leeding to constant arguments at the phase shes at right now. And I cheish having her in bed every night. Its the most empty space on earth when shes in ICU……. Roxy the Staffie will ge...
by Paul Barker
Thu Mar 28, 2024 3:54 pm
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 17
Views: 599

Re: GM70 Monoblocks’

My state of mind is much better now I’ve weeded out the failed components and arrived at something that sounds better than the pse 801@ and that Ive put to bed class A2. These GM70’s do such a good job in A1 I see a good amp at the end of the tunnel. Im glad I bought the Quad’s. Diana is on board a...
by Paul Barker
Thu Mar 28, 2024 3:47 pm
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 17
Views: 599

Re: GM70 Monoblocks’

My state of mind is much better now I’ve weeded out the failed components and arrived at something that sounds better than the pse 801@ and that Ive put to bed class A2. These GM70’s do such a good job in A1 I see a good amp at the end of the tunnel.
by Paul Barker
Thu Mar 28, 2024 3:20 pm
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 17
Views: 599

Re: GM70 Monoblocks’

I think it needs the extra gain of the 6072 but I could leave it as it is and get some volume. Im glad you agree about the EL34 and that you and I are on the same page. I agree a quick first pass is the way to go for me in my state.id like to try and get the tributes and output valves done tidy if I...
by Paul Barker
Thu Mar 28, 2024 9:12 am
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 17
Views: 599

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: 17
Views: 599

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: 31599

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: 31599

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: 31599

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: 31599

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: 17
Views: 599

Re: GM70 Monoblocks’

Image
Image

Image

Image
by Paul Barker
Tue Mar 26, 2024 5:19 am
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 17
Views: 599

Re: GM70 Monoblocks’

by Paul Barker
Mon Mar 25, 2024 12:53 pm
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 17
Views: 599

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: 516

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: 17
Views: 599

Re: GM70 Monoblocks’

Image