[Amps] SB-230 Power Question

[n8de at thepoint.net]

The SB-230 was designed to be used with the SB-104 which had slightly  
lower output on 10m than the other bands.

My experience with my SB-230 (still have it, but don't use it) was  
that 650 watts was pretty high output for 80m & 40m ...

I think your tube is fine.

73
Don
N8DE


Quoting K4MT <k4mt at yahoo.com>:

> I recently acquired a SB-230 thinking the tube was probably bad with  
>  an idea of doing a GI7B project. To my surprise the amp puts out  
> 650  watts plus on my peak reading wattmeter on SSB 80/40 Meters  
> with 100  W drive..
>
> On the bands from 20 and up the power output drops.  20 Meters is  
> about 550, 15 meters about 350-400 and I  have not tried 10m.  
>
> I recapped PS, rebuilt tube grid circuit and repaired some bad   
> soldering and out of tolerance parts, replaced grid bypass   
> capacitors, removed entire tank circuit and band switch. Cleaned   
> bandswitch and cleaned/resoldered all connections.
>
> Still power on higher bands drop as above.
>
> Any experts on this amp out there who might have an idea what might  
> be going on. Is this a sign of a weak tube?  Since I get so much  
> power output on 80/40M I would think the tube must still have some  
> life in it.
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