[TenTec] Titan 425 Meter lamps?

[Jim Brown]

  On 10/2/2010 7:28 PM, CSM(r) Gary Huber wrote:
> It seems to me there are several different lamp supply voltages depending
> upon the build date and the version of the 425 in question.
>
> I have 28 VDC replacements for my early Titan (S/N 425-00516) which was
> export model and I believe the lamps in my Titan 425E are in parallel.

That's right -- it depends on the vintage of the Titan 425.  All use two 
bulbs, but some versions use two 12V-14V bulbs in series and others use 
28V bulbs in parallel.  You'll need to open the amp up and look to see 
which version you have.

BTW -- there are 425 schematics (about 95% complete) on my website as 
pdf files. I've not drawn the details of the various resonant circuits 
(which also vary with vintage).

http://audiosystemsgroup.com/publish.htm

73, Jim Brown K9YC