RAP Transatlantic and valve help, please.
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Hi guy's,
Acquired this set as I liked the look of it. It's a RAP Transatlantic, not too much info on this, no Trader sheets, but I think a member posted a self made schematic :thumbsup: It has been smothered in dark varnishy sludge, put on with a brush, didn't even take the knobs off. Hoping to get this back to original. Full of spiders and a bit of woodworm :( One of the valve top caps came off leaving a wee wire sticking out of the glass, was thinking I can solder the cap back on. Would this be OK or better with a replacement? I have stabilized another valve with epoxy the glass was loose from the base. The speaker is wrapped in a cloth bag, which seems a nice touch. Another valve I've had to soak with WD40 as it's seized in the holder. Will post update pics as I restore. Thanks for looking. Cheers Lee |
Re: RAP Transatlantic and valve help, please.
Hi Lee, yes you should be OK to resolder the wire tip back to the top cap. Useful to add a blob of araldite under the top cap rim first. Jerry
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Re: RAP Transatlantic and valve help, please.
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Cheers Lee |
Re: RAP Transatlantic and valve help, please.
Hi Lee, do the soldering quickly to prevent damage to the glass.
Do not use too "strong" a glue on glass as it may cause it to crack, not sure what the gorilla is like but may be a bit strong, Araldite or Bostik should be OK Ed |
Re: RAP Transatlantic and valve help, please.
Yes be careful with the glue you use. Better to use one of the 'Impact' adhesives like Evo-Stik or Bostik since they don't set rock-hard and have 'give' in them which is better for expansion when the glass gets hot.
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Re: RAP Transatlantic and valve help, please.
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Have spent all day restoring the case and chassis, just need to get my head around the waxies now, no trader sheet. Some of them are hard to reach :( Thanks Lee |
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Re: RAP Transatlantic and valve help, please.
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Lee |
Re: RAP Transatlantic and valve help, please.
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A few progress pics.
All gunk has been removed from the case using a water based paint stripper and IPA. Speaker fabric removed and washed, must have been in a smokers home, water turned yellow and I could smell the nicotine. Worm holes filled, case wiped down with white spirit, stain applied to blend everything. Danish oil applied - 3 coats. Currently working on the chassis. Thanks for looking. |
Re: RAP Transatlantic and valve help, please.
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Have been working on this set for a few day's now, found a couple of shorts in those cables that are sheathed with metal fabric, one going to the top of a valve and another on the underside of the chassis. Managed to fix :thumbsup:
All waxies and electolytics replaced. One question. The BIG can is a joint 8uF and 16uF cap, now on the schematic it refers to 2 off 8uF caps, I am not sure if this is correct or if my can is wrong. The can measured 13uF and 32uF so well off what it is labelled as. So I assumed the 13uF was 8uF connection wise and the 32uF was 16uF, have no idea if this is correct. Anyhow I fitted a 10uF(all I had) to go to the point the 13uF was connected to and a 16uF to go to the point the 32uF was connected to. I have ordered 8uF electrolytics. The set is now up and running. Was wondering, do I replace the 10uF and the 16Uf FOR 2 OFF 8Uf when they arrive. or just replace the 10uF for an 8uF. Or leave well alone as the set works? Hopefully makes sense. Cheers, guy's. |
Re: RAP Transatlantic and valve help, please.
10uf in place of 8uf is fine. C21 is possibly ok with 16uF. I love this model , car dealers special as Gerry Wells called them! Yes, I too have one and they work well.
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Re: RAP Transatlantic and valve help, please.
When capacitors measure higher values than stated it is usually because the test meter is being deceived by high leakage current.
Peter |
Re: RAP Transatlantic and valve help, please.
Thanks for the tip Peter. I was using the wee blue capacitance and ESR meter, have seen a lot of Youtubers using them.
Cheers Lee |
Re: RAP Transatlantic and valve help, please.
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Guy's, think that's it all restored, I'm sure the speaker cloth is original to.
The dial lights up nicely, didn't realise it was a colour one. Also I managed to change all the caps under the wave change switch without removing it. Cheers Lee |
Re: RAP Transatlantic and valve help, please.
Well done! You may be right about the speaker cloth but it does differ from the Radiomuseum set and the Worthpoint set.
Peter |
Re: RAP Transatlantic and valve help, please.
It's beautiful, especially the case. How does it sound?
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Sounds really nice as well, in fact now pride of place in my dining room, another nice feature of this set is no tuning cord and I think it has precision tuning to. Tuning knob is free to move slightly until it hits a top on the shaft then a bit more effort to quick tune. Nice features on a set of this age. Cheers Lee |
Re: RAP Transatlantic and valve help, please.
You've made an absolutely cracking job of the case on that radio. It is the part of the work that I enjoy the most- my rule is never to do the case until the "innards" are working !
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