[Boatanchors] LM-13 Frequency Meter

[Pete Lancashire]

These may help answer the B+ question

http://www.vk2bv.org/museum/lm.htm

http://www.pa3esy.nl/military/us/meet/LM20/pdf/LM-13.pdf

On Tue, Jul 22, 2014 at 2:36 PM, Dave Brown <tractorb at ihug.co.nz> wrote:
> Were the LMs designed for a much higher HT voltage than the BC-221 series?
> I have a couple of LMs here. One is virtually original- complete with canvas
> cover and has not been powered on in a long time but I'm in the process of
> sorting out a power supply for it.  Which raised the question-what should
> the HT supply voltage be?  The other one has a 'commercial' PSU associated
> with it of UK origin which delivers 300 volts HT and it drifts
> significantly- possibly as a result of the HT being too high-or at least
> thats what I thought. I know the BC-221 used a battery supply around 90
> volts for the HT but - what was the original power supply arrangement for
> the LM series and what was the nominal HT?
> 73
> Dave
> ZL3FJ
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