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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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24th Sep 2020, 4:55 pm | #1 |
Pentode
Join Date: Dec 2015
Location: Abingdon on Thames, Oxon, UK.
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Help required with Regentone chassis
I have been toying with the idea of restoring an FM receiver, when I remembered I have most of a Regentone chassis at the back of the garage. It does not seem to have a model number but I think it was removed from a radiogram cabinet someone was dumping. The ferrite rod has gone (to fix my Roberts) as has the output valve which I suspect was an EL84. The other valves are ECC88 (broken) EZ80, EABC80, EF80 and one with the information erased, as well as a magic eye.
Thanks for looking Ken |
24th Sep 2020, 5:07 pm | #2 |
Heptode
Join Date: Mar 2017
Location: Romsey, Hampshire, UK.
Posts: 511
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Re: Help required with Regentone chassis
Hi
Looks mid 1950's. Similar to an A155 table set ? More likely an ECC85 than an ECC88. That yellow Plessey electrolytic will almost certainly be faulty. Usual advice to change the grid coupling cap to the EL84, then other waxies if their circuit position makes leakage a problem. What else do you want to know / how skilled are you ? |
24th Sep 2020, 5:07 pm | #3 |
Dekatron
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
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Re: Help required with Regentone chassis
https://www.radiomuseum.org/r/regentone_arg71.html
Possibly? Service sheet available from the link at the top of this page if it’s the correct one.
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Frank |
24th Sep 2020, 5:20 pm | #4 |
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Location: Basildon, Essex, UK.
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Re: Help required with Regentone chassis
No SW on the ARG71
More like this one https://www.radiomuseum.org/r/regentone_a155a_15.html or this one https://www.radiomuseum.org/r/regentone_arg79arg_7.html Mike |
24th Sep 2020, 6:08 pm | #5 |
Tetrode
Join Date: Jan 2008
Location: Shetland, UK.
Posts: 79
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Re: Help required with Regentone chassis
This Regentone radiogram now in my daughter's living room.
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24th Sep 2020, 9:26 pm | #6 |
Pentode
Join Date: Dec 2015
Location: Abingdon on Thames, Oxon, UK.
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Re: Help required with Regentone chassis
Thanks everyone for the suggestions, so it could be an A155. I will check the valve line up more closely to see if it corresponds. OK on the Plessey cap, yes that will go as well as the other suspects. Did you see the square, red Lemco capacitor? Would that have been original - I remember those from Decca Navigator days.
One other thing, on the right of the chassis there are two unused holes which could have been extra valves - was there a p-p output version maybe? Ken |
24th Sep 2020, 9:45 pm | #7 |
Pentode
Join Date: Dec 2015
Location: Abingdon on Thames, Oxon, UK.
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Re: Help required with Regentone chassis
After downloading the service sheet I see the answer to the extra holes may be that the chassis was also used in a television.
And Cecil, the radiogram looks fabulous! 73 Ken |
24th Sep 2020, 9:56 pm | #8 |
Rest in Peace
Join Date: Mar 2011
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Re: Help required with Regentone chassis
Yes there was a push pull output version https://www.radiomuseum.org/r/regentone_nine_3nine.html
Mike |
25th Sep 2020, 9:42 am | #9 |
Dekatron
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Location: Southwold, Suffolk, UK.
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Re: Help required with Regentone chassis
An excellent, if often, under-appreciated chassis. This appeared in a number of table sets and radiogram versions, some with multiple speakers. It gave a very good frequency range and much apparent power output from that single EL84. Note the size of the OPTX which contributes to this. There was nothing wrong with these Regentones!
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Edward. |
25th Sep 2020, 11:58 am | #10 |
Pentode
Join Date: Dec 2015
Location: Abingdon on Thames, Oxon, UK.
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Re: Help required with Regentone chassis
Interesting about the push-pull version, and tempting to convert it, but doubt if I'd find an op transformer. And from what Edward says, the single EL84 should be fine.
I've seen the Nine-3 described as a stereogram, which I suppose it could be with the ECC83 used as a pair of drivers and single EL84s per channel, but there would need to be another op transformer somewhere. I also need to make a cabinet for it, which should keep me occupied for a while. Ken |
27th Sep 2020, 12:36 pm | #11 |
Heptode
Join Date: Sep 2014
Location: Coventry, West Midlands, UK.
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Re: Help required with Regentone chassis
the NINE-3, also used in the ARG150s, is definitely stereo as I have one and it sounds great. It uses the same basic chassis as the A155, which was modified for other models too, including the one in #5 which is called the Continental, I have one of those too and it has 3 speakers. Both of the output transformers on the NINE-3 were under the chassis. The push pull version was used in the ARG150 and NINE-16 ,I have one of those too, models which used an ECC83 as phase splitter and tone compensation amp. A very versatile and all round good chassis
Steve |
28th Nov 2020, 1:20 pm | #12 |
Pentode
Join Date: Dec 2015
Location: Abingdon on Thames, Oxon, UK.
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Re: Help required with Regentone chassis
Finally got round to starting work on this set. Components ordered, I noticed that nearly all the resistors are out of spec. After removing the glass I see that the tuning indicator surround seems to have melted. Any idea what it was and can it be removed from the valve?
Also, it seems that the reflector panel behind the glass dial is supported partly by some kind of rubber bushes which have perished. As the panel is also bolted to the chassis they do not appear to be for electrical insulation. Can anyone suggest why this has been done. Thanks Ken |
28th Nov 2020, 1:57 pm | #13 | |
Dekatron
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Location: Leominster, Herefordshire, UK.
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Re: Help required with Regentone chassis
Quote:
White rubber by the look of it. Pick it off carefully. Pretty much any solvent that works could be used to clean up the remains from the indicator bottle if you're not worried about any markings! Petrol outdoors perhaps?
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22nd Jan 2021, 7:18 pm | #14 |
Pentode
Join Date: Dec 2015
Location: Abingdon on Thames, Oxon, UK.
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Re: Help required with Regentone chassis
The output transformer of this chassis (ARG79 probably) appears to have a pair of grey wires coming from the primary that don't appear on the circuit diagram. They are connected together on a tag strip but to nothing else. DC resistance between the grey pair and blue (anode of EL84) is 215 ohms, between grey pair and yellow (HT) is 309 ohms so not quite a centre tap. Anyone know what it's for?
Thanks Ken |
22nd Jan 2021, 9:23 pm | #15 |
Dekatron
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Location: Newcastle upon Tyne, Tyne & Wear, UK.
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Re: Help required with Regentone chassis
Hi Ken, it could be a screen grid connection when used in UL mode, so could be quite a good standard transformer
Ed |
22nd Jan 2021, 11:25 pm | #16 |
Pentode
Join Date: Dec 2015
Location: Abingdon on Thames, Oxon, UK.
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Re: Help required with Regentone chassis
Thanks Ed. Yes, I suppose it could be a tapping used in different circuits.
Ken |