For giggles, a repair this week for a mate'
before, with a flashover between screen and grid. Burnt about a 2mm hole though the board:
And here's after judicious use of hacksaw and new ceramic sockets mounted to chass:
Not shown is replacement of caps or installation of trimpot for bias.
In-between the two photos, 50 years worth of gunge was washed off the chassis using persil and hot water:
Demuntification of flashed over sockets in a Jansen bass 50
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- Ashton
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Re: Demuntification of flashed over sockets in a Jansen bass 50
AwesomePaulWD wrote: ↑Mon Apr 10, 2023 3:20 pm For giggles, a repair this week for a mate'
before, with a flashover between screen and grid. Burnt about a 2mm hole though the board:
IMG_20230330_181913_1.jpg
And here's after judicious use of hacksaw and new ceramic sockets mounted to chass:
IMG_20230407_163550.jpg
Not shown is replacement of caps or installation of trimpot for bias.
In-between the two photos, 50 years worth of gunge was washed off the chassis using persil and hot water:
IMG_20230402_113124.jpg
So, is that low alcohol or no alcohol at all? mmmm, no alcohol, do you want to try it? Noooooooooo.
- MikeC
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Re: Demuntification of flashed over sockets in a Jansen bass 50
Nice! 45-odd years ago I had a Jansen Bassman 75 go up in smoke like this!Bg wrote: ↑Mon Apr 10, 2023 4:05 pmAwesomePaulWD wrote: ↑Mon Apr 10, 2023 3:20 pm For giggles, a repair this week for a mate'
before, with a flashover between screen and grid. Burnt about a 2mm hole though the board:
IMG_20230330_181913_1.jpg
And here's after judicious use of hacksaw and new ceramic sockets mounted to chass:
IMG_20230407_163550.jpg
Not shown is replacement of caps or installation of trimpot for bias.
In-between the two photos, 50 years worth of gunge was washed off the chassis using persil and hot water:
IMG_20230402_113124.jpg
Whakanuia o mea kei a koe
- RectifiedAmps
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Re: Demuntification of flashed over sockets in a Jansen bass 50
Great work!
I've seen an arced bassman that burnt through ceramic sockets! The voltages in Jansens (and Holdens) are just unreal.
I've seen an arced bassman that burnt through ceramic sockets! The voltages in Jansens (and Holdens) are just unreal.
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- Ashton
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Re: Demuntification of flashed over sockets in a Jansen bass 50
Cheers. Was all going smoothly until I checked the heater voltage. I forgot that jansen used 12.6v taps. At least I checked before plugging in the tubes. Heaters were rewired making use of the filament CT to get 6.3v