[Boatanchors] LM-13 Frequency Meter

[Dave Brown]

Thanks Pete. That handbook provides all the answers. I wasn't aware of the 
power supply HT options built in.
I better look into the one I have with the drift issue as it may not have 
been strapped properly for the higher HT rail.
In any case - the lower the better these days- I'll try with 150 initially 
for the other one and see if its making enough 'noise' to be useable at 
that.
73
 Dave, ZL3FJ


----- Original Message ----- 
From: "Pete Lancashire" <pete at petelancashire.com>
To: "Dave Brown" <tractorb at ihug.co.nz>
Cc: "Boat Anchors List" <boatanchors at mailman.qth.net>
Sent: Wednesday, July 23, 2014 9:53 AM
Subject: Re: [Boatanchors] LM-13 Frequency Meter


> 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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