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 UPS for 1950s HMV
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 Return to top of page · Post #: 1 · Written at 6:23:29 PM on 13 April 2020.
SBR's Gravatar
 SBR
 Location: Clarendon, SA
 Member since 13 April 2020
 Member #: 2411
 Postcount: 2

Hi

I have a circa 1950’s His Masters Voice radiogram.
It looks to have some form of valve type amplifier.
I use the radio as background listening for emergency warnings (fire reports and updates) on my rural property - however the device becomes useless during power outages, which are a regular event in fire season.
Can I install a UPS to this radiogram?
If so what type of ups would be best and any particular recommendations?
Appreciate any help or advice

Thanks

Sean


 
 Return to top of page · Post #: 2 · Written at 7:04:03 PM on 13 April 2020.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 6352

My experience at running valve radios on UPSs isn't good and this includes the better sinewave ones with surge proctection built in. There is too much background noise coming from the UPS to get a clear signal. The same applies to inverters.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 3 · Written at 7:13:52 PM on 13 April 2020.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6013

I would strongly advise using a modern radio for listening to emergency broadcasts, and have more than one available. As the bush walking and survivalist communities like to say "Two becomes one. One becomes none."

To guard against Murphy providing you with flat batteries just when you can't get any fresh ones, and batteries corroding away in unused radios, there are some solutions such as these:

https://www.aussiedisposals.com.au/wind-up-solar-radio

https://www.aussiestormshop.com.au/products/dynamo-solar-hand-crank-am-fm-radio-power-bank-led-flashlight-black

I can't vouch for the sensitivity of those particular receivers if you are distant from the transmitters, but you get the idea.


 
 Return to top of page · Post #: 4 · Written at 7:39:35 PM on 13 April 2020.
Vintage Pete's avatar
 Location: Albury, NSW
 Member since 1 May 2016
 Member #: 1919
 Postcount: 1993

Amazing the old HMV can pick up signal if it's isolated.
Have a few 50s Radiograms and none are very sensitive.
You need a good modern radio to listen too ,it's much more sensitive.


 
 Return to top of page · Post #: 5 · Written at 8:39:41 PM on 13 April 2020.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4345

My Nasty solution to miniature valves with silver migration, is to dip their base in Hydrochloric Acid, which washes off easily.


 
 Return to top of page · Post #: 6 · Written at 8:50:15 PM on 13 April 2020.
SBR's Gravatar
 SBR
 Location: Clarendon, SA
 Member since 13 April 2020
 Member #: 2411
 Postcount: 2

Thanks Brad, thought it may be worth a try however you have confirmed my initial concerns.


 
 Return to top of page · Post #: 7 · Written at 8:52:59 PM on 13 April 2020.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 6352

One thing I didn't do when experimenting was earthing the radio. I don't normally earth valve radios when I am using them because they usually behave without one. This caused me to miss earthing. Whether it would make a difference or not is another thing.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 8 · Written at 9:00:07 PM on 13 April 2020.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6013

I think you have the wrong thread, Marcc.


 
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