Tubular dial lamp for HMV sets - UK Vintage Radio Repair and Restoration Discussion Forum

kalee99 · 20th Jul 2008, 10:29 pm

Hi all,
Just found this supplier of lamps and they have a stock of lamps to fit the HMV sets that use this odd mains tubular lamp. It is a slightly higher wattage but my guess is it will be fine or alter the bulb tapping on the transformer?
Either way it saves a lot of modification of other types of lamp and looks just like the real thing

http://www.lampspecs.co.uk/Light-Bul...-100mm?whence=

kalee99 · 22nd Jul 2008, 7:00 pm

Hi,
Thought folks would like to see the lamp in place.
Paul.

Phil G4SPZ · 24th Jul 2008, 9:05 pm

Quote:

Originally Posted by kalee99

...It is a slightly higher wattage but my guess is it will be fine...

I assume the original lamp would have been rated at 15 watts, and if so, a 25 watt lamp represents a 66% increase, and over time the additional heat and current could damage the dial or transformer. If the set were mine, I'd be inclined to insert a resistive or (better still) capacitive dropper in series to reduce the lamp dissipation a bit. My rough calculations suggest a series resistor of 1.2 k (10 watts) or 2.5 uF as a starting point, but adjustment may be necessary.

Good lamp supplier, though, with a wide range of odd types. Thanks for posting!

kalee99 · 24th Jul 2008, 10:10 pm

Hi,
Yes I agree having had time to experiment I have fitted a 1KΩ 10 watt resistor in series and that seems to be about right. It is certainly simpler to fit a resistor than trying to change lamp bases etc

The lamp looks just the job

Paul.

humphrey · 30th Aug 2008, 6:49 pm

You should have gone for these ones. Only a little shorter. http://www.lampspecs.co.uk/Light-Bul...4Pa38Ta38Mch10
The 55W looks like a missprint.

kalee99 · 30th Aug 2008, 8:14 pm

Hi,
Already tried one of these and unfortunately they have a "coiled", filament which only gives a spot of light. The tubular lamp I am using has a single festoon filament running along the tube.
Thanks anyway,
Paul.

humphrey · 30th Aug 2008, 8:28 pm

Au contraire, I was just about to order them. Thanks.

humphrey · 25th Sep 2008, 4:16 pm

After looking at the crazy prices wanted for shipping, I got a microwave lamp rated at 15W and a socket with a rubber expanding collar intended for a table lamp. The whole dial is illuminated with no heat concerns.

kalee99 · 25th Sep 2008, 5:13 pm

Hi,
I shall have to have a look at one in my local DIY shop. The ones I saw when looking the last time all appeared to have filaments that were to short or circular in construction.
Paul.

20th Jul 2008, 10:29 pm	#1
kalee99 Rest in Peace Join Date: Dec 2004 Location: Newcastle Upon Tyne, Tyneside, UK. Posts: 420	Tubular dial lamp for HMV sets Hi all, Just found this supplier of lamps and they have a stock of lamps to fit the HMV sets that use this odd mains tubular lamp. It is a slightly higher wattage but my guess is it will be fine or alter the bulb tapping on the transformer? Either way it saves a lot of modification of other types of lamp and looks just like the real thing http://www.lampspecs.co.uk/Light-Bul...-100mm?whence=

22nd Jul 2008, 7:00 pm	#2
kalee99 Rest in Peace Join Date: Dec 2004 Location: Newcastle Upon Tyne, Tyneside, UK. Posts: 420	Re: Tubular dial lamp for HMV sets Hi, Thought folks would like to see the lamp in place. Paul. Attached Thumbnails

24th Jul 2008, 10:10 pm	#4
kalee99 Rest in Peace Join Date: Dec 2004 Location: Newcastle Upon Tyne, Tyneside, UK. Posts: 420	Re: Tubular dial lamp for HMV sets Hi, Yes I agree having had time to experiment I have fitted a 1KΩ 10 watt resistor in series and that seems to be about right. It is certainly simpler to fit a resistor than trying to change lamp bases etc The lamp looks just the job Paul.

30th Aug 2008, 6:49 pm	#5
humphrey Retired Dormant Member Join Date: Aug 2008 Location: Bellac, 87. France. Posts: 357	Re: Tubular dial lamp for HMV sets You should have gone for these ones. Only a little shorter. http://www.lampspecs.co.uk/Light-Bul...4Pa38Ta38Mch10 The 55W looks like a missprint. Last edited by humphrey; 30th Aug 2008 at 7:17 pm.

30th Aug 2008, 8:14 pm	#6
kalee99 Rest in Peace Join Date: Dec 2004 Location: Newcastle Upon Tyne, Tyneside, UK. Posts: 420	Re: Tubular dial lamp for HMV sets Hi, Already tried one of these and unfortunately they have a "coiled", filament which only gives a spot of light. The tubular lamp I am using has a single festoon filament running along the tube. Thanks anyway, Paul.

30th Aug 2008, 8:28 pm	#7
humphrey Retired Dormant Member Join Date: Aug 2008 Location: Bellac, 87. France. Posts: 357	Re: Tubular dial lamp for HMV sets Au contraire, I was just about to order them. Thanks.

25th Sep 2008, 4:16 pm	#8
humphrey Retired Dormant Member Join Date: Aug 2008 Location: Bellac, 87. France. Posts: 357	Re: Tubular dial lamp for HMV sets After looking at the crazy prices wanted for shipping, I got a microwave lamp rated at 15W and a socket with a rubber expanding collar intended for a table lamp. The whole dial is illuminated with no heat concerns.

25th Sep 2008, 5:13 pm	#9
kalee99 Rest in Peace Join Date: Dec 2004 Location: Newcastle Upon Tyne, Tyneside, UK. Posts: 420	Re: Tubular dial lamp for HMV sets Hi, I shall have to have a look at one in my local DIY shop. The ones I saw when looking the last time all appeared to have filaments that were to short or circular in construction. Paul.