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17th May 2008, 12:34 pm | #1 |
Hexode
Join Date: May 2006
Location: Arlesey, Bedfordshire, UK.
Posts: 401
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Straightening a warped back
Hi folks,
I bought a GEC Mains 3 at the NVCF which is now working well (as well as you could expect for a 2 valve set anyway), but the back is very concave and almost touches the speaker magnet! At present I have the back weighted down with large & heavy books on the floor, but 3 days of this don't seem to have made much improvement. Should I try steaming it and then re-pressing? I'm a bit nervous of causing any irreparable damage to such a fragile thing. Thanks, Ian Blackbourn |
17th May 2008, 1:12 pm | #2 |
Retired Dormant Member
Join Date: Nov 2007
Location: Carmarthenshire, Wales.
Posts: 80
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Re: Straightening a warped back
Perhaps an idea, not sure if it would work, but place greece proof paper over the back and then use an old iron to warm it?
Not sure where you'd go from there but it might be a less risky option than steaming, Sam |
17th May 2008, 1:14 pm | #3 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,935
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Re: Straightening a warped back
Think it needs to be dampened a bit
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17th May 2008, 1:40 pm | #4 |
Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,865
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Re: Straightening a warped back
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19th May 2008, 6:34 pm | #5 |
Hexode
Join Date: May 2006
Location: Arlesey, Bedfordshire, UK.
Posts: 401
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Re: Straightening a warped back
Well, I held the offending item over the saucepan in which we were steaming the cabbage one evening. This made it nice and damp feeling. Left it pressed under several bound volumes of Wireless World for a couple of days, and Bingo! - almost completely flat. Let's hope it stays that way.
Nick's idea of the steamy bathroom sounds even better, but we always have showers, and our bathroom doesn't get very steamy - I've never seen the mirror steamed up! Thanks, Ian |
19th May 2008, 7:39 pm | #6 |
Rest in Peace
Join Date: Jul 2006
Location: Somerset, UK.
Posts: 2,356
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Re: Straightening a warped back
I took a drastic action with a radio back that was badly warped .I have a wood burning stove , the top can boil a kettle . I ran water from the tap over the back sat it on the stove with a weight from a dumbell for a couple of mins , then did it again ,and it was just about perfect with a little scorch mark , so I recon a slightly more gentle option would certainly work ok
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19th May 2008, 8:55 pm | #7 |
Pentode
Join Date: Aug 2005
Location: Hemel Hempstead, Hertfordshire, UK.
Posts: 154
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Re: Straightening a warped back
Last time I had this problem I soaked the back in the bath for half an hour, then stuck it on the bench in the shed between two sheets of aluminium with a couple of bricks on top. Didn't stick and came out pretty flat. I then touched the blinges and scratches up with some of my Humbrol enamels mixed to match and was quite happy with the result.
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