UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Effect of cathode strapped suppresor grid?

Andrew B · 19th Mar 2017, 11:09 pm

Understood G6Tanuki, the nearest it has to monitoring grid current is the "ALC", which monitors the finals grid voltage, turning down the drive if they go positive. I have a pair of PL519's in good condition and a pair of ceramic bases, so just need to sort out a filament transformer 40v @ 0.6A. The finals heater come from a separate winding on the main transformer, so no heater chain problems.

The only other thing that I have noticed is that when loading into the dummy load, the "loading" capacitor has little effect on I.C., and little on power out, although it seems to need to be set on full capacitance to achieve any power out. Maybe one of the switched loading caps has gone O/C? Any opinions are valued.

Thanks
Andrew

19th Mar 2017, 11:09 pm	#7
Andrew B Heptode Join Date: May 2015 Location: Bradford, West Yorkshire, UK. Posts: 512	Re: Effect of cathode strapped suppresor grid? Understood G6Tanuki, the nearest it has to monitoring grid current is the "ALC", which monitors the finals grid voltage, turning down the drive if they go positive. I have a pair of PL519's in good condition and a pair of ceramic bases, so just need to sort out a filament transformer 40v @ 0.6A. The finals heater come from a separate winding on the main transformer, so no heater chain problems. The only other thing that I have noticed is that when loading into the dummy load, the "loading" capacitor has little effect on I.C., and little on power out, although it seems to need to be set on full capacitance to achieve any power out. Maybe one of the switched loading caps has gone O/C? Any opinions are valued. Thanks Andrew Attached Thumbnails __________________ worried about the electrons entering the circuit and the smoke leaving Andrew