[ARC5] Receiver current drain / output impedance

[Henry Mei'l's]

Dennis,

I've also observed improved oscillator frequency stability in my WS19 MkII 
using reduced  B+ voltages.
Also use the then-standard plate to 2-8 ohm trafo to drive speakers on my 
Command Set receivers.
Happen to a have a couple of 600 ohm speakers and several 600 to low-ohm 
trafos.
Philips produced 600 ohm speakers at one time.

Henry
oz1uf  n2nr

----- Originalel Message ----- 
From: "Dennis Monticli" <dennis.monticelli at gmail.com>
To: "Neil" <neilb at ihug.co.nz>
Cc: "ARC-5" <ARC5 at mailman.qth.net>
Sent: Friday, January 07, 2011 5:25 AM
Subject: Re: [ARC5] Fw: Receiver current drain


> Even though my sets run off a nominal 60V, there is sufficient undistorted
> audio available when a proper matching transformer is used.  I've also run
> 90V B+ and both overall gain and audio drive improve as expected.  The key
> is not to tolerate a poor 12A6 to speaker impedance match situation.
>
> Dennis AE6C
>
> On Thu, Jan 6, 2011 at 8:05 PM, Neil <neilb at ihug.co.nz> wrote:
>
>> > The original output transformer is perfectly suitable for a number of
>> > different military loudspeakers.  Which ones depends upon which radio 
>> > set
>> family
>> > the receiver comes from.
>>
>> Oh of course, and everyone has at least one of those loudspeakers ;-)
>>
>> 73 de Neil ZL1ANM
>>
>>