>G'day Ampers,
>
>I had a couple of spare hours today to play with the Dentron Clipperton L
>amp I mentioned a few days ago.
>
>I measured the filament volts at the socket pins. 7.32 Volts was the result!
>
>With a combination of resistors in line, (7 x 0.47 Ohm/5w WW in parallel) I
>now have it set to 6.15 Volts with 245 Volts on the mains. Hopefully that
>will keep the new tubes happy.
>
>I guess it was not surprising that the 572B's which came with the amp were
>dead flat. Funny enough, they were probably the original tubes. They are
>marked Dentron, all with 7850 date codes.
>
>To answer Rich's last question on the subject of the tubes' demise, no,
>there are no shorts in any tubes. None that I could measure with an ohm
>meter anyway.
>
** Tnx, Alek. A high-potential breakdown tester might show a problem
since the meltballs you see indicate that the grid may have come in
contact with something.
cheerz
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