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Old 24th Sep 2020, 4:55 pm   #1
Ken Taylor
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Default 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
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Old 24th Sep 2020, 5:07 pm   #2
Mr 1936
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Default 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 ?
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Old 24th Sep 2020, 5:07 pm   #3
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Default 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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Old 24th Sep 2020, 5:20 pm   #4
crackle
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Default 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
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Old 24th Sep 2020, 6:08 pm   #5
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Default Re: Help required with Regentone chassis

This Regentone radiogram now in my daughter's living room.
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Old 24th Sep 2020, 9:26 pm   #6
Ken Taylor
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Default 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
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Old 24th Sep 2020, 9:45 pm   #7
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Default 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
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Old 24th Sep 2020, 9:56 pm   #8
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Default Re: Help required with Regentone chassis

Yes there was a push pull output version https://www.radiomuseum.org/r/regentone_nine_3nine.html
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Old 25th Sep 2020, 9:42 am   #9
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Default 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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Old 25th Sep 2020, 11:58 am   #10
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Default 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
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Old 27th Sep 2020, 12:36 pm   #11
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Default 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
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Old 28th Nov 2020, 1:20 pm   #12
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Default 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
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Old 28th Nov 2020, 1:57 pm   #13
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Default Re: Help required with Regentone chassis

Quote:
Originally Posted by Ken Taylor View Post


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?

Thanks
Ken

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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Old 22nd Jan 2021, 7:18 pm   #14
Ken Taylor
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Default 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
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Old 22nd Jan 2021, 9:23 pm   #15
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Default 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
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Old 22nd Jan 2021, 11:25 pm   #16
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Default Re: Help required with Regentone chassis

Thanks Ed. Yes, I suppose it could be a tapping used in different circuits.

Ken
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