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by Paul Barker
Thu Mar 28, 2024 11:00 pm
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 26
Views: 670

Re: GM70 Monoblocks’

But I appreciate the suggestions.

GM70 driving GM70 if I had a suitable choke or interstage. But the interstage is OK for EL34 and EL34 is OK in the role.
by Paul Barker
Thu Mar 28, 2024 10:51 pm
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 26
Views: 670

Re: GM70 Monoblocks’

The driver has to swing 240v peak to peak, EL34 more suitable than EL84 especially the EL84 pinches up more trying to achieve the full drive voltage for full power in the GM70. EL34 fits the need. https://i.postimg.cc/hGTCQQKb/IMG-1183.jpg Not possible to get the drive swing without severe distortio...
by Paul Barker
Thu Mar 28, 2024 10:34 pm
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 26
Views: 670

Re: GM70 Monoblocks’

Well theyre popular on ebay. Someone ‘s using them. Not cheap. Must be good. Probably the demand is they may fit in transmitters.
by Paul Barker
Thu Mar 28, 2024 10:20 pm
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 26
Views: 670

Re: GM70 Monoblocks’

Amaising power but the transformers are 50mA.
by Paul Barker
Thu Mar 28, 2024 9:47 pm
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 26
Views: 670

Re: GM70 Monoblocks’

E130L vary in price some are hundreds. I’ll look them up in vade Mecum
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by Paul Barker
Thu Mar 28, 2024 9:39 pm
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 26
Views: 670

Re: GM70 Monoblocks’

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by Paul Barker
Thu Mar 28, 2024 9:39 pm
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 26
Views: 670

Re: GM70 Monoblocks’

I’ll see if that valve is abailable also like el84. Arguably the best WAD amp. Ive just stripped out a Rosenblit amp that broke and wasnt made to work on. I didnt like the sound either. I have kept the filament transformer. Not sure about keeping the attenuator. Ive left it for now. Not sure if I ca...
by Paul Barker
Thu Mar 28, 2024 3:54 pm
Forum: Everyones Projects
Topic: GM70 Monoblocks’
Replies: 26
Views: 670

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: 26
Views: 670

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: 26
Views: 670

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: 26
Views: 670

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: 26
Views: 670

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: 26
Views: 670

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: 31908

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: 31908

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.