I LOL'd!Cressy Snr wrote: ↑Tue Oct 24, 2017 2:56 pm
After that he gave me a hand bell and sent me on my way.
6B4G - The Resurrection Shuffle
- Dave the bass
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#226 Re: 6B4G - The Resurrection Shuffle
"The fat bourgeois and his doppelganger"
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#227 Re: 6B4G - The Resurrection Shuffle
Sgt. Baker started talkin’ with a Bullhorn in his hand.
#228 Re: 6B4G - The Resurrection Shuffle
Looks like Whicker's World is on...Cressy Snr wrote: ↑Fri Oct 13, 2017 4:19 pm
My gran had the above, 1958 KB Royal Star telly in the 60s when I was very young.
Sorry, I couldn't resist!
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#229 Re: 6B4G - The Resurrection Shuffle
Got a bit done today.
Have nearly finished wiring in all the mains stuff and the filament transformers for the 2A3s.
Busbars are in for the grounding scheme. Mains will be tested tomorrow once the wiring is done.
In the case of the filament transformers, I'm reusing 12 year old bits so a few wires have had to be jointed to extend them, and the joints sealed with heatshrink sleeving.
OPTs are next on the list to be wired in, plus the speaker outlets. Then the power supply and finally the audio circuits.
May be done and playing by next weekend. There's no rush.
Have nearly finished wiring in all the mains stuff and the filament transformers for the 2A3s.
Busbars are in for the grounding scheme. Mains will be tested tomorrow once the wiring is done.
In the case of the filament transformers, I'm reusing 12 year old bits so a few wires have had to be jointed to extend them, and the joints sealed with heatshrink sleeving.
OPTs are next on the list to be wired in, plus the speaker outlets. Then the power supply and finally the audio circuits.
May be done and playing by next weekend. There's no rush.
Sgt. Baker started talkin’ with a Bullhorn in his hand.
- Cressy Snr
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#230 Re: 6B4G - The Resurrection Shuffle
Got on nicely today and the result of that effort is a full set of heaters and filaments.
Thermal delay relay switches in the rectifier heater winding after a delay of 45 seconds.
This gives the heaters and filaments of the audio circuit valves nearly a minute to warm up, then at the appointed time, the relay contacts close and HT should come up nice and smooth, rising to the design value with no overshoot.
Thermal delay relay switches in the rectifier heater winding after a delay of 45 seconds.
This gives the heaters and filaments of the audio circuit valves nearly a minute to warm up, then at the appointed time, the relay contacts close and HT should come up nice and smooth, rising to the design value with no overshoot.
Sgt. Baker started talkin’ with a Bullhorn in his hand.
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#231 Re: 6B4G - The Resurrection Shuffle
Phwoaar !
"Once you find out ... the Circumstances ; then you can go out"
#232 Re: 6B4G - The Resurrection Shuffle
Larverly Steve!
- Dave the bass
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#233 Re: 6B4G - The Resurrection Shuffle
Halt the project!
That Artex has got to go before any more amp building.
That Artex has got to go before any more amp building.
"The fat bourgeois and his doppelganger"
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#234 Re: 6B4G - The Resurrection Shuffle
Oof ! Yes - good call there Dave .
"Once you find out ... the Circumstances ; then you can go out"
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#235 Re: 6B4G - The Resurrection Shuffle
It's only the hobby room.Dave the bass wrote: ↑Sat Oct 28, 2017 9:57 pm Halt the project!
That Artex has got to go before any more amp building.
Bare floorboards too.
A veritable indoor shed.
Sgt. Baker started talkin’ with a Bullhorn in his hand.
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#236 Re: 6B4G - The Resurrection Shuffle
Amp is now wired up, working and on soak test:
No transformer snubber networks yet, apart from the choke.
Mains transformer and choke are both rubber mounted to minimise mechanical hum.
Very little heater hum from the output stage. Voltages stay rock steady courtesy of a proper choke input power supply.
No transformer snubber networks yet, apart from the choke.
Mains transformer and choke are both rubber mounted to minimise mechanical hum.
Very little heater hum from the output stage. Voltages stay rock steady courtesy of a proper choke input power supply.
Sgt. Baker started talkin’ with a Bullhorn in his hand.
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#237 Re: 6B4G - The Resurrection Shuffle
Trialling in the system now:
Lovely tone squire.
A bit of hum when things are quiet. I think the heater centre tap for the inputs and drivers heating arrangement needs moving, but apart from that, things are sounding pretty sweet. The JJ 2A3-40 are nice valves.
But Jesus, it's BIG.
Lovely tone squire.
A bit of hum when things are quiet. I think the heater centre tap for the inputs and drivers heating arrangement needs moving, but apart from that, things are sounding pretty sweet. The JJ 2A3-40 are nice valves.
But Jesus, it's BIG.
Last edited by Cressy Snr on Mon Oct 30, 2017 6:13 pm, edited 1 time in total.
Sgt. Baker started talkin’ with a Bullhorn in his hand.
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#238 Re: 6B4G - The Resurrection Shuffle
I've never said this before, but...
... shabby!
... shabby!
Vivitur ingenio, caetera mortis erunt
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#239 Re: 6B4G - The Resurrection Shuffle
Nah, not really
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#240 Re: 6B4G - The Resurrection Shuffle
It's big compared to my NVA A20
Got an old style teething problem, that both Simon and myself have experienced a couple of times in our amp building careers
Decided to try some rectifier rolling...bad move.
A previously nice sounding old Bentley 5U4G rectifier valve promptly flashed over at switch on, blowing the mains fuse in the IEC connector and taking out one of the solid state diodes in the hybrid bridge. Oh poo!
Never mind, more robust replacement diodes will be fitted tomorow, the base cover and feet made and the wooden end cheeks Danish oiled.
Normal service will resume shortly.
Got an old style teething problem, that both Simon and myself have experienced a couple of times in our amp building careers
Decided to try some rectifier rolling...bad move.
A previously nice sounding old Bentley 5U4G rectifier valve promptly flashed over at switch on, blowing the mains fuse in the IEC connector and taking out one of the solid state diodes in the hybrid bridge. Oh poo!
Never mind, more robust replacement diodes will be fitted tomorow, the base cover and feet made and the wooden end cheeks Danish oiled.
Normal service will resume shortly.
Sgt. Baker started talkin’ with a Bullhorn in his hand.