The fact that these 50-60 year old radios have continued running well on the parts that they were made from is a testament to their overall good design.?
Most of the problems appearing in these sets today are due to long-term ageing of the components.?
IMO, in most ¡ª but not all ¡ª situations, the original parts specs have served very well. When we replace an original part, most of us?will be long-gone before it will need replacement again.?
You won¡¯t go wrong replacing like with like.?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS
On Wed, Mar 15, 2023 at 20:45, Rick WA6III <
myr748@...> wrote:
Even at? 400ma (total) cathode current, those 15¦¸ cathode resistors (@200ma ea)? would only dissipate (I2R) about 0.6W
Since no one (ever) operates a T4X key down at 400ma , 1W cathode resistors would have more than enough headroom....
6JB6 screen current per tube would have to be over 120ma for the screen resistor to dissipate 1w.? Somehow I think the screen current is a fraction of 120.
Just looked on eBay and found 15¦¸, 68¦¸ 1% 1w film type resistors for something like $3 and free shipping.
"10 Pieces 1 Watt 1% metal film resistors Over 200 Various Value YOU CHOOSE"
And if you want higher power ......
"10Pcs 5W 5 Watt Metal Film Resistor ¡À1% 0.1 - 91 ¦¸ Ohm 0.1 R to 91 R 6*17MM"
Just do a search for the above text on eBay.
Cheers,
Rick
--
73/Rick
WA6III
*Every post is created using Linux
