UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Bazz4CQJ · 27th Jan 2018, 12:02 am

Many thanks for that Al. Did you note my comments in post #8 of the thread regarding the deliberate inclusion of a resistor of 10-20k in parallel with the cathode choke, and if so, any comment on that? Much of this finer stuff is "above my pay grade" (comment on BBC pay grades, avoided).

Do you have any comment re my guess that the RFC in the picture (a couple of posts ago) of the Model 59 head would be 200-300uH?

Bits are arriving for my M59-Homage project. As a minimum, I simply want that to work from 5-150MHz, so should be straight forward. The split-stator tuning cap I have have as a swing of ~ 4-45pF, a bit smaller than ideal (the M59 runs to 110pF) but apart from the swing, it's a nice component for this specific task and, crunching the numbers in Excel, looks like there need not be too many coils for my needs.

My numerous medical appointments wiped out the last week, but my root canal now seems fine, so I should be firing on at least three cylinders this coming week (don't ask if it's a 4 or a 6). A visit to Redditch is pencilled in - where is that Kevlar vest?

B

27th Jan 2018, 12:02 am	#83
Bazz4CQJ Dekatron Join Date: Apr 2009 Location: Oxfordshire, UK. Posts: 4,934	Re: The Best GDO Ever Made? Many thanks for that Al. Did you note my comments in post #8 of the thread regarding the deliberate inclusion of a resistor of 10-20k in parallel with the cathode choke, and if so, any comment on that? Much of this finer stuff is "above my pay grade" (comment on BBC pay grades, avoided). Do you have any comment re my guess that the RFC in the picture (a couple of posts ago) of the Model 59 head would be 200-300uH? Bits are arriving for my M59-Homage project. As a minimum, I simply want that to work from 5-150MHz, so should be straight forward. The split-stator tuning cap I have have as a swing of ~ 4-45pF, a bit smaller than ideal (the M59 runs to 110pF) but apart from the swing, it's a nice component for this specific task and, crunching the numbers in Excel, looks like there need not be too many coils for my needs. My numerous medical appointments wiped out the last week, but my root canal now seems fine, so I should be firing on at least three cylinders this coming week (don't ask if it's a 4 or a 6). A visit to Redditch is pencilled in - where is that Kevlar vest? B __________________ Saturn V had 6 million pounds of fuel. It would take thirty thousand strong men to lift it an inch.