Search found 8835 matches
- Sun Mar 17, 2024 9:01 am
- Forum: Everyones Projects
- Topic: 6550 SE Amplifier
- Replies: 104
- Views: 8472
Re: 6550 SE Amplifier
https://i.postimg.cc/JztSR81n/IMG-1154.jpg At the moment single ended one valve has a 4k6 load, but I drew the above to see what PSE looks like but the opt’s are 2k ohm. This graph represents 4k because two EL34’s achieve double the power. So power out becomes 16 watts. Don’t ask me where the disto...
- Sun Mar 17, 2024 7:07 am
- Forum: Everyones Projects
- Topic: OK…so I’m on wi’ summat
- Replies: 135
- Views: 23686
Re: OK…so I’m on wi’ summat
Agree.
- Fri Mar 15, 2024 9:04 pm
- Forum: Everyones Projects
- Topic: 6550 SE Amplifier
- Replies: 104
- Views: 8472
Re: 6550 SE Amplifier
I found the electro harmonix EL34’s sound much better. But thats a bonus because a single New Boxed GE 6550 /KT88 £195 on Ebay. So Ive got 8 and 6 used but work like new 4 sovtec and two Tungsol made in Britain. so I can sell those, since EL34 much better sounding.
- Fri Mar 15, 2024 6:41 pm
- Forum: Everyones Projects
- Topic: OK…so I’m on wi’ summat
- Replies: 135
- Views: 23686
Re: OK…so I’m on wi’ summat
Oh pooh, really sorry to have to tell you this, honest I wasn’t copying you. I adjusted b+ in my amp to get g2A 425v the bias on the cathode 39v 48 mA. 21 watts dissipation. Totally better by a mile than the 6550.Diana just nuck up on me, I nearly jumped out my skin. “Gosh its sounds really……signifi...
- Fri Mar 15, 2024 5:26 pm
- Forum: Everyones Projects
- Topic: OK…so I’m on wi’ summat
- Replies: 135
- Views: 23686
Re: OK…so I’m on wi’ summat
Envious
- Fri Mar 15, 2024 5:18 pm
- Forum: Everyones Projects
- Topic: 6550 SE Amplifier
- Replies: 104
- Views: 8472
Re: 6550 SE Amplifier
The good news is non of the output valves are sounding any different but a couple GE’s are 5v down in bias. The 4 Sovtec’ all ST62 are 5v down including the fourth which was never used. The GE’s sound better and drawer more current. But the Sovtec’s are all the same as the new one of the four. So no...
- Wed Mar 13, 2024 10:07 am
- Forum: Everyones Projects
- Topic: GM70 Monoblocks’
- Replies: 4
- Views: 273
Re: GM70 Monoblocks’
https://i.postimg.cc/6Q6frQ9X/IMG-1152.jpg So Ive drawn a 4k resistive load. +150v anode and g2 -6v bias. Not having enquired anywhere as of yet. But 2v peak seems to convert to 150v peak. GM70 needs 120 volts peak. Assuming the 10y mu of 8 I can get gain of 6 from. Not having calculated the circui...
- Wed Mar 13, 2024 9:08 am
- Forum: Everyones Projects
- Topic: GM70 Monoblocks’
- Replies: 4
- Views: 273
- Wed Mar 13, 2024 9:07 am
- Forum: Everyones Projects
- Topic: GM70 Monoblocks’
- Replies: 4
- Views: 273
Re: GM70 Monoblocks’
The first difficulty is a matched pair of power chokes capable of choke input. If anyone has bought such a pair and regrets it. paulv1505@ insert the applemail ending here. I have a pair of cores in a double C core transformer. One core of that monster per channel would make said pair of chokes. But...
- Wed Mar 13, 2024 8:28 am
- Forum: Everyones Projects
- Topic: GM70 Monoblocks’
- Replies: 4
- Views: 273
GM70 Monoblocks’
https://i.postimg.cc/JzQ7GJ9h/IMG-1149.jpg https://i.postimg.cc/ZKp5zXHp/IMG-9131.jpg quick image upload So discovering how much power is available in A1 SE and how low 2nd harmonic at the Maximum Power. The project worth the effort. Many years ago I bought the power transformers pictured, likewise...
- Tue Mar 12, 2024 2:44 pm
- Forum: Everyones Projects
- Topic: 6550 SE Amplifier
- Replies: 104
- Views: 8472
- Tue Mar 12, 2024 9:11 am
- Forum: Everyones Projects
- Topic: 6550 SE Amplifier
- Replies: 104
- Views: 8472
Re: 6550 SE Amplifier
Thanks for pointing out the risk.
Now that this amp is bedded down on the top floor I’ll have to build something for ground floor.
Now that this amp is bedded down on the top floor I’ll have to build something for ground floor.
- Tue Mar 12, 2024 9:09 am
- Forum: Everyones Projects
- Topic: 6550 SE Amplifier
- Replies: 104
- Views: 8472
Re: 6550 SE Amplifier
Yes, and probably the 6550’s are slow. Its just I’d not thought of the power out condition, but I suppose it is going to occur sooner or later. Call me a Luddite but Ive just ordered a dls10, even though I know I spotted one lately. At £17 on ebay delivered, not a huge cost, meanwhile I’ll hope ther...
- Tue Mar 12, 2024 6:34 am
- Forum: Everyones Projects
- Topic: 6550 SE Amplifier
- Replies: 104
- Views: 8472
Re: 6550 SE Amplifier
I see, so if there is an outage, the power supply would come straight on without enough current demand for critical inductance and momentarily reach 1.414. So I need a slow start for the valve diodes.. there was a slaw start idea in a Glass Audio letter. I think it was to pass the ground connection ...
- Mon Mar 11, 2024 12:04 pm
- Forum: Everyones Projects
- Topic: 6550 SE Amplifier
- Replies: 104
- Views: 8472
Re: 6550 SE Amplifier
The Quads seem as efficient as the kEF’s. This 8/9 watt amp drives them good.