[Heathkit] SB 110 power info needed

[Glen Zook]

12.6 volts at 4.335 amps.  The tube heaters/filaments are wired in a series parallel arrangement.

One thing that can be done is to change the 6146 heaters from a series connection to a parallel connection and then use 6883 or 6883A/8032 tubes in the final amplifier section.  Those tubes are identical to the 6146 series except that they have 12.6 volt heaters.  The 6883 and 6883A/8032 are very common and often are prices considerably lower than the 6146 series because there were so many used in the commercial two-way market.

Just make sure and put a tag on the final amplifier cage to remind yourself (or any future buyer) that the tubes have been changed so that you do NOT burn out the heaters by putting in 6146 series tubes.  I have 6883A/8032 tubes in my SB-110A and have modified other SB-110 series plus other transmitters that have the 6146 series tube heaters in series to use the 6883 series tubes.

Glen, K9STH

Website:  http://k9sth.com


--- On Fri, 10/24/08, Greg Mijal <bluebirdtele at embarqmail.com> wrote:

From: Greg Mijal <bluebirdtele at embarqmail.com>

Does anyone know what the filament requirements are for the SB 110 and the SB 110A?