¿ªÔÆÌåÓý

ctrl + shift + ? for shortcuts
© 2025 Groups.io

Re: T4XC failure?


 

¿ªÔÆÌåÓý

Are you saying that the parasitic choke got hot enough to melt solder? Safe bet the tube(s) are bad.

Gary

W0DVN

On Dec 29, 2024, at 2:13?PM, Jay W6CJ via groups.io <lastradioman@...> wrote:

Gary & Group,

More info-
Suspecting that I slagged my finals, I looked in the cage.
Saw a fresh solder blob near the base of the choke and a lead popped out from one of the parasitic choke resistors.

Looks like I'll need parasitic chokes (my hands can't make my own) and a pair of finals to substitute?

Suggestions welcome

73
Jay
W6CJ



On Fri, Dec 27, 2024 at 6:58?PM Jay W6CJ via??<lastradioman=duck.com_at_groups.io_lastradioman@...> wrote:
Gary-
About 50mA, keying in CW mode.
In Tune mode, about 90-100mA.


On Fri, Dec 27, 2024 at 5:08?PM Gary Follett via?groups.io?<xntrick1948=comcast.net_at_groups.io_lastradioman@...> wrote:
Do you get idle plate current when you key the radio?

Gary

W0DVN

On Dec 27, 2024, at 7:00?PM, Jay W6CJ via?groups.io?<lastradioman=[email protected]> wrote:

Gary-
Using an AC4-R supply.
PA plate, plate, filament, dial light and bias voltages are getting to the T4XC.
Dead driver or finals?


On Fri, Dec 27, 2024 at 9:52?AM Gary Follett via?groups.io?<xntrick1948=comcast.net_at_groups.io_lastradioman@...> wrote:
There was a reason the power supply fuse popped. Check voltages there first.

Gary W0DVN

On Dec 27, 2024, at 10:54?AM, Jay W6CJ via?groups.io?<lastradioman=[email protected]> wrote:

Group,
I'd welcome any advice on where to start looking.??

The 5A fuse on the AC4 blew in my absence.
Replaced the fuse, and cannot get a peak greater than 0.1A when switching from SSB to tune, regardless of the gain setting on 80 and 40.??

D'oh.....? ??

73
Jay
W6CJ




Join [email protected] to automatically receive all group messages.