14-02-2016, 06:14 PM
Hi.
TBH the impedance tends to vary with valve radios from 200 to as much a 1000 ohms.
Any step up RF transformer from 6:1 to 12:1 will work, often trial and error will give the best result.
Mind this is an RF matching transformer not a Balun! Here's one I lashed up this afternoon, its about 6-7:1 works a treat!
TBH the impedance tends to vary with valve radios from 200 to as much a 1000 ohms.
Any step up RF transformer from 6:1 to 12:1 will work, often trial and error will give the best result.
Mind this is an RF matching transformer not a Balun! Here's one I lashed up this afternoon, its about 6-7:1 works a treat!
