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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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31st Jan 2013, 7:54 pm | #1 |
Retired Dormant Member
Join Date: Apr 2012
Location: Leeds, West Yorkshire, UK.
Posts: 33
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Very poor reception. HMV 1127
Mentioned this radio before but thought this needed a new thread.
I have the above radio. After changing a couple of bits here and there and replacing all paper caps, it's now working. However reception is terrible. AM is quiet and faint with only a couple of stations being able to be received when holding the ferrite aerial. LW is just noise although Five Live can be heard faintly when touching the aerial. All resistors check out ok on the multimeter. The ferrite is a wax covered one with no signs of damage. I'm waiting on a sig gen being delivered, although I've never done alignment before and don't really know what I'm doing. So any advice on either the problem or the process of alignment would be greatly appreciated. |
31st Jan 2013, 10:53 pm | #2 |
Pentode
Join Date: Jul 2011
Location: Mission Viejo, California, USA
Posts: 144
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Re: Very poor reception. HMV 1127
Alignment is not difficult, you just have to take your time and go through the steps in the correct order. You will need an analog volt meter to connect to the voice coil, or an oscilloscope, and a set of non-metal adjustment tools. It is also helpful to have a frequency counter to verify that the signal generator is outputting the desired frequency. Very small differences in adjustments are usually significant, but you will develop a feel for that as you perform more alignments.
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1st Feb 2013, 4:37 pm | #3 |
Pentode
Join Date: Jan 2013
Location: Ulverston, Cumbria, UK.
Posts: 115
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Re: Very poor reception. HMV 1127
Hi,
I am waiting on a signal generator in the post and have not done it before so will keep an eye on how you get on, http://www.vintage-radio.com/project...indicator.html. This is a link to a project to build on here for an audio output meter, should be useful. Have bought the bits to build one, not much to it so only cheap. Good luck, Mike. |
1st Feb 2013, 5:14 pm | #4 |
Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,844
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Re: Very poor reception. HMV 1127
Any evidence of the cores having been twiddled?
If no, then do check other things first, e.g. cleanliness of the wavechange switch contacts, and the valve pins/sockets. Nick. |
1st Feb 2013, 8:23 pm | #5 |
Retired Dormant Member
Join Date: Apr 2012
Location: Leeds, West Yorkshire, UK.
Posts: 33
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Re: Very poor reception. HMV 1127
No evidence of tamper at all.
So I cleaned all pins and holders and the switch contacts. No improvement. |
19th Feb 2013, 2:18 pm | #6 |
Retired Dormant Member
Join Date: Apr 2012
Location: Leeds, West Yorkshire, UK.
Posts: 33
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Re: Very poor reception. HMV 1127
After much fiddling with cores I seem to be getting somewhere.
Now have 5/6 clearish stations. Which is a big improvement on none. Still not really clear though which leads me to suspect something else is amiss here. Also LW is slightly puzzling. It is supposed to be fixed on Radio 4 long wave, however the only station I can get is Radio 5 MW. Does this suggest anything to anybody? |
19th Feb 2013, 2:21 pm | #7 | |
Nonode
Join Date: Jan 2008
Location: Milton Keynes, Bucks. UK.
Posts: 2,552
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Re: Very poor reception. HMV 1127
Quote:
__________________
When I die, please don't let my Wife sell my collection for the amount I told her I paid for it! Last edited by camtechman; 19th Feb 2013 at 2:22 pm. Reason: adding quotes |
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19th Feb 2013, 2:25 pm | #8 |
Retired Dormant Member
Join Date: Apr 2012
Location: Leeds, West Yorkshire, UK.
Posts: 33
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Re: Very poor reception. HMV 1127
Five live can be heard clearly now.
Aerial coils are wax covered and undamaged. |
19th Feb 2013, 4:27 pm | #9 |
Pentode
Join Date: Feb 2013
Location: Wirral, Merseyside, UK.
Posts: 118
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Re: Very poor reception. HMV 1127
In my opinion I agree with Nick as I once got a Roberts RM20 radio (MW/LW only) and I could not get any reception out of it no matter what, so I decided to take the back panel off carefully and saw a few box like things with adjustment screws in the middle of them, some had wax on them to lock the screws in the pre set position and some looked tampered with, after using a small flat bladed screw driver and turning those adjustment screws very slowly one direction or the other while the radio was going, hey presto! I began getting stations on MW and even on LW too! which was just very loud humming/buzzing sound before I tried those adjustment thingys.
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