Marconi TF2016 problem - UK Vintage Radio Repair and Restoration Discussion Forum

kernowcam · 13th Dec 2019, 9:16 am

My trusty TF2016 is back in use.
It's working OK but the output frequency is slowly dropping even after an hours warm up.
Any ideas before I try to locate the manual please?

WME_bill · 13th Dec 2019, 2:39 pm

TF2016.
As it uses different oscillators for the two highest frequency ranges. I suggest identify which frequency ranges give trouble. I suspect a doubtful oscillator transistor or drifting tuning voltages to the vari-cap diodes.
I have the manuals for both TF2016A (HF generator) and TF2015 (VHF generator). Send me a private message if you want a copy, which I will put on a CD. It comes to about 20M.
wme_bill.

13th Dec 2019, 9:16 am	#1
kernowcam Pentode Join Date: Dec 2011 Location: Camelford, Cornwall, UK. Posts: 188	Marconi TF2016 problem My trusty TF2016 is back in use. It's working OK but the output frequency is slowly dropping even after an hours warm up. Any ideas before I try to locate the manual please?

13th Dec 2019, 2:39 pm	#2
WME_bill Octode Join Date: Oct 2007 Location: Exeter, Devon, UK. Posts: 1,554	Re: Marconi tf2016 problem TF2016. As it uses different oscillators for the two highest frequency ranges. I suggest identify which frequency ranges give trouble. I suspect a doubtful oscillator transistor or drifting tuning voltages to the vari-cap diodes. I have the manuals for both TF2016A (HF generator) and TF2015 (VHF generator). Send me a private message if you want a copy, which I will put on a CD. It comes to about 20M. wme_bill.