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New 5G9 build blew a fuse
Okay tonight I got everything finished, hooked up a speaker, started it up. fine
Got about 372VDC B+
Idles at about 371VDC on each Plate
and about 370VDC on each Screen
cathodes measure about 31mA each (1R 1% resistors to ground) at idle
All heaters lit up
Turned up the vol, got a nice quite hiss
Turned up the trem got a nice quite pulsing hiss - goes a little too fast when dimed and maybe not slow enough when cut - I must be able to change the value of something in the oscillator circuit (but don't know what or how much).
Haven't plugged in my gueetar yet.
Switched it on and off several times when testing the voltages and tube current using the standby, then mains switch. No problem
Switched it off, one more time, but then decided to switch it back on again and nothing. Checked the fuse - black as the ace of spades, changed it, amp is working again - touch wood. I haven't bench tested it yet (other than a minute or two)
What would've caused that (a mini power surge?)? I've got a backup recto tube - maybe I'll try that and see if there is any problem. The one it blew the fuse with was an EH5U4GB - anyone have problems with those?
Got about 372VDC B+
Idles at about 371VDC on each Plate
and about 370VDC on each Screen
cathodes measure about 31mA each (1R 1% resistors to ground) at idle
All heaters lit up
Turned up the vol, got a nice quite hiss
Turned up the trem got a nice quite pulsing hiss - goes a little too fast when dimed and maybe not slow enough when cut - I must be able to change the value of something in the oscillator circuit (but don't know what or how much).
Haven't plugged in my gueetar yet.
Switched it on and off several times when testing the voltages and tube current using the standby, then mains switch. No problem
Switched it off, one more time, but then decided to switch it back on again and nothing. Checked the fuse - black as the ace of spades, changed it, amp is working again - touch wood. I haven't bench tested it yet (other than a minute or two)
What would've caused that (a mini power surge?)? I've got a backup recto tube - maybe I'll try that and see if there is any problem. The one it blew the fuse with was an EH5U4GB - anyone have problems with those?
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