18-11-2020, 06:38 PM
(18-11-2020, 08:50 AM)peter scott Wrote: Here's 2.5 Mhz on an MW 6-2. I think you'll have to go the extra half a meg.That would still be projected to something like 21 inch diagonal, but will see what I can achieve on the small CRT.
Peter
I have done a bit more playing with is best for me to add a couple of traps and have added two in the EF91 anodes off the HT. I have been trying hard to get the required frequency response, but it dawned on me this evening that I need to include the tuner and mixer stage from the front end, what I do just on the IF stage could have very little effect.
Anyway the two traps located above board in this picture:-
Not very neat but having an effect, also included is a simple IF plot from the test set leading and impeadances are all wrong, but used for indication only. probably a third trap will be added when I get the tuner and have it working.
I have ordered an EC900 and ECF801 from Ebay, so that the tuner can be used from a 6.3 volt heater winding. I believe the PCF801 is fu-bared anyway.
Adrian.
Learning as I go!
Youtube EF91 Valve
Youtube EF91 Valve