I love the EL34.Paul Barker wrote: ↑Fri Mar 15, 2024 6:41 pm 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……significant.”
So its now a EL34 Triode amp.
Vade mecum says 2nd 8% power 6 watt. It has come alive. EL34 transes the 6550.
OK…so I’m on wi’ summat
- Cressy Snr
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#121 Re: OK…so I’m on wi’ summat
Sgt. Baker started talkin’ with a Bullhorn in his hand.
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#122 Re: OK…so I’m on wi’ summat
I was going to stop at around 4:00 today, but after tea, Melanie decided she was going to watch a recording of, "Celebrity Big Brother Live and Late!"
I didn't need much encouragement to leave the room, go upstairs and continue with the build. Got the power supply wired up and the OPTs connected to the output valve sockets: Now that's definitely it for today.
I didn't need much encouragement to leave the room, go upstairs and continue with the build. Got the power supply wired up and the OPTs connected to the output valve sockets: Now that's definitely it for today.
Sgt. Baker started talkin’ with a Bullhorn in his hand.
#123 Re: OK…so I’m on wi’ summat
Just in time to watch "Celebrity Big Brother Live and Late!"...
All looking good Steve.
All looking good Steve.
Sorry, I couldn't resist!
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#124 Re: OK…so I’m on wi’ summat
Cheers Ray.
Should be finished by Sunday.
Should be finished by Sunday.
Sgt. Baker started talkin’ with a Bullhorn in his hand.
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#126 Re: OK…so I’m on wi’ summat
All the circuitry is done. Just the four inputs to cable to the selector switch.
It all works and biases up correctly:
It all works and biases up correctly:
Sgt. Baker started talkin’ with a Bullhorn in his hand.
#127 Re: OK…so I’m on wi’ summat
Can’t believe you have built this from scratch in a week!
Wonderful to watch this taking shape, thanks!
Wonderful to watch this taking shape, thanks!
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#128 Re: OK…so I’m on wi’ summat
Absolutely fab.
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
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#129 Re: OK…so I’m on wi’ summat
Agree.
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." – Albert Einstein
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#130 Re: OK…so I’m on wi’ summat
Thanks chaps.
Amp is finished. Last two jobs were to cable the input sockets to the selector switch and to put a reinforcing piece of anodised aluminium L section along the bottom edge of the rear panel, to match the one at the front:
Amp is finished. Last two jobs were to cable the input sockets to the selector switch and to put a reinforcing piece of anodised aluminium L section along the bottom edge of the rear panel, to match the one at the front:
Sgt. Baker started talkin’ with a Bullhorn in his hand.
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#131 Re: OK…so I’m on wi’ summat
Amp undergoing soak testing in the system.
Sgt. Baker started talkin’ with a Bullhorn in his hand.
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#132 Re: OK…so I’m on wi’ summat
Circuits:
1. Audio Circuit with measured voltages:
2. Choke input power supply:
1. Audio Circuit with measured voltages:
2. Choke input power supply:
Sgt. Baker started talkin’ with a Bullhorn in his hand.
#133 Re: OK…so I’m on wi’ summat
Shoddy!
- Cressy Snr
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#135 Re: OK…so I’m on wi’ summat
It’s back in the system after the cosmetic facelift and power supply upgrade.
Sounds great with the LCRCRC supply. Glad I searched out the 450V transformer, despite the head scratching over the primary phasing.
Sounds great with the LCRCRC supply. Glad I searched out the 450V transformer, despite the head scratching over the primary phasing.
Sgt. Baker started talkin’ with a Bullhorn in his hand.