I have received quite a few requests for info on my simple mod to 

put my Heath SB-1000 on 6 meters. Here's how I did it.



With the aid of my MFJ 259B and a bit of research using the ARRL 

Handbook chapter on Amplifiers and more than one note to Mr. 

Measures, I came up with this:



Input pi network: 33pF on rig side, 1 ½ turns on 10 meter slug 

(iron core all the way out) and 10pF on tube side.



Output network: Move 10 meter tap out towards the tune cap until 

there is 1 turn left between your tap point and the tuning cap 

(about 1 ¼ turns).



With 80 watts input (Icom 551D) I get 725 watts output into a non

radiating load. On air reports indicate clean audio, clean signal.

Tuning is touchy in that small adjustments make big differences 

very quickly as opposed to the more relaxed rate of tuning on the

lower bands. I still have full functionality on 160-15, the way the

amp was designed originally. I only lost(?) 10 meter capability.



Parts required for the mod: 1 10pF 500V and 1 33pF 500V capacitor 

available from Mouser for about $.80 each. I spent $300 for the 

amp at the HossTraders spring meet so I have nearly a King's 

ransom in it now ($301.60!!).



Hope this info proves useful to the reader.

John Wilcox  NS1Z

FN44rn

ns1z@agate.net

fon: 207-364-2246



871 Route 120

Rumford, ME 04276-3836