How much hot should the finals get?

[Limeybastard]

That s

That doesn't sound like anything to worry about. As long as your fan is running you should be fine.

You have an amp with 4 large bipolar transistors. To create power it takes energy which in turn creates heat.

Your deadkey is good and your amperage draw looks way better now. A high SWR can have some affect too.

Do you recall the radio getting just as hot previously?

Bias set too high on the radio finals?

The IRF520 is power hungry, and tends to make that part run hot even when bias is set correctly. 10 or 20 mA per final (on the radio pc board) is safer.

73

Lord knows if the BIAS is set incorrectly, the hi and low deadkey was and fourstringburn helped me make the relevant adjustments to normality in that area. It was deadkeying at 250W before with swing past 400W.
I wouldnt know how to check the BIAS level.

 

[Limeybastard]

B754 can get hot in AM. That is why we go npc/rc/rwotb. No more heat, better performance.
Mike

Excuse my dumbness, what does that mean above? Any links to read about it? cheers

EDIT, never mind saw a post about it here.
http://www.copperelectronics.com/discus4/messages/34/75475.html?1138473562

 

[fourstringburn]

Excuse my dumbness, what does that mean above? Any links to read about it? cheers

EDIT, never mind saw a post about it here.
http://www.copperelectronics.com/discus4/messages/34/75475.html?1138473562

That's a warranty voiding mod… fo do at your own peril.

 

[Limeybastard]

That's a warranty voiding mod… fo do at your own peril.

Very much doubt I'll be doing that mod anytime soon. LOL