UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Radio (domestic)

Notices

Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only.

Reply
 
Thread Tools
Old 8th Feb 2020, 11:51 am   #1
Spike47
Diode
 
Join Date: Jan 2020
Location: Cleveland, North Yorkshire, UK.
Posts: 3
Default Bush DAC 90 or DAC 90A

Hi.

Looking at this Bush Radio DAC 90, it says DAC 90 on the rear cover, but the font looks like a DAC 90A!

Spike
Attached Thumbnails
Click image for larger version

Name:	is it a Bush DAC 90 or 90A 1.jpg
Views:	138
Size:	114.0 KB
ID:	198604   Click image for larger version

Name:	is it a Bush DAC 90 or 90A  Rear cover.jpg
Views:	161
Size:	130.9 KB
ID:	198605  
Spike47 is offline   Reply With Quote
Old 8th Feb 2020, 12:16 pm   #2
'LIVEWIRE?'
Dekatron
 
'LIVEWIRE?''s Avatar
 
Join Date: Mar 2006
Location: N.W. Oxfordshire(Chipping Norton)
Posts: 7,286
Default Re: Bush DAC 90 or DAC 90A

The DAC90A uses 8-pin all glass valves, whereas, IIRC, the 90 uses Octal types
'LIVEWIRE?' is offline   Reply With Quote
Old 8th Feb 2020, 12:47 pm   #3
60 oldjohn
Nonode
 
Join Date: Dec 2004
Location: East Yorkshire, UK.
Posts: 2,533
Default Re: Bush DAC 90 or DAC 90A

Cloth looks like DAC90 they have tuning knob on right end of set with wave change switch on front of set. DAC90A have wave change lever on end of set and metal grill. There ave many original variations of these two sets as they evolved. The rear view is a giveaway DAC90 always have a burn hole top right in the back cover (Assuming the back has not been altered)

John.
__________________
My favourite text message "Ill be there in five minutes, if not read again"

Last edited by 60 oldjohn; 8th Feb 2020 at 12:53 pm.
60 oldjohn is offline   Reply With Quote
Old 8th Feb 2020, 12:49 pm   #4
DonaldStott
Heptode
 
DonaldStott's Avatar
 
Join Date: Aug 2015
Location: Glasgow, UK.
Posts: 756
Default Re: Bush DAC 90 or DAC 90A

Those large metallised valves look like a DAC90 to me: -

DAC90


DAC90A
__________________
BVWS Member
DonaldStott is offline   Reply With Quote
Old 8th Feb 2020, 1:01 pm   #5
Paul_RK
Nonode
 
Paul_RK's Avatar
 
Join Date: Nov 2003
Location: Fakenham, Norfolk, UK.
Posts: 2,829
Default Re: Bush DAC 90 or DAC 90A

Yes, I'm not seeing anything DAC90A at all about this one. The wavechange knob at the front is marked with L and M just as it should be on a DAC90.

Paul
Paul_RK is offline   Reply With Quote
Old 8th Feb 2020, 1:13 pm   #6
60 oldjohn
Nonode
 
Join Date: Dec 2004
Location: East Yorkshire, UK.
Posts: 2,533
Default Re: Bush DAC 90 or DAC 90A

I have a black DAC90 which I use most days, for safety I removed the mains dropper (Curtain Burner) and fitted an auto transformer. This is an official modification and makes the set into a Bush AC90 doing this also removes the danger of having asbestos in the room, the set still remains a Live Chassis. The circuit is in the Manufacturers DAC90 info available for 1.99 top right of this page. The auto transformer is available from forum member Ed Dinning Local to you.

John.
__________________
My favourite text message "Ill be there in five minutes, if not read again"
60 oldjohn is offline   Reply With Quote
Old 8th Feb 2020, 1:14 pm   #7
electrogram
Heptode
 
Join Date: Jul 2008
Location: Hereford, UK.
Posts: 565
Default Re: Bush DAC 90 or DAC 90A

It is a DAC90 not DAC90a, but the tuning scale is from a DAC90a
electrogram is offline   Reply With Quote
Old 8th Feb 2020, 1:31 pm   #8
Techman
Nonode
 
Techman's Avatar
 
Join Date: Nov 2009
Location: Lincolnshire, UK.
Posts: 2,706
Default Re: Bush DAC 90 or DAC 90A

That set (a DAC90) has had some previous attention.

It should have a separate plug in mains lead, but the plug pins look to have been removed and the cable permanently attached.

The back cover at the top has had some sort of repair that is blocking the all important vent holes in this location. There's a very hot dropper just behind that part of the cover which needs all the cooling help it can get so as not to crack the Bakelite of the cabinet top just above it. The slots need to be re-made or that repair needs to be removed - it could be made from a combustible material with a potential fire risk! The dropper behind runs very hot, so has a heat shield surrounding it which is lined with fibrous heat resisting asbestos which usually gets folk jumping up and down in blind panic! You have to remember that with ANY vintage electronics, that there is very likely to be hazardous materials used in the construction, so ALWAYS be prepared to take precautions and do any cleaning of the internals outside in the garden. Whatever you do, don't get a vacuum cleaner anywhere near that asbestos as you'll contaminate the machine and its filters and it'll blow and spread the dangerous fibres all around your house every time you use it. As for the asbestos heat shield lining itself, just leave it alone and avoid disturbing it and it'll be just fine for the next 70 plus years.
Techman is offline   Reply With Quote
Old 8th Feb 2020, 5:00 pm   #9
AC/HL
Moderator
 
AC/HL's Avatar
 
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 7,876
Default Re: Bush DAC 90 or DAC 90A

Apology up front, but as pedantry is popular here, curtain burner was the epithet associated with the line cord on an imported midget radio, although careless placing of a DAC90 could have the same effect.
__________________
Bill, BVWS member
AC/HL is offline   Reply With Quote
Old 8th Feb 2020, 10:22 pm   #10
Ed_Dinning
Dekatron
 
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 5,813
Default Re: Bush DAC 90 or DAC 90A

Hi Folks, I have seen at least 2, 90a sets where the octal punchings in the chassis had been plated over with an adapter for the B8A valveholders

Ed
Ed_Dinning is offline   Reply With Quote
Old 8th Feb 2020, 10:37 pm   #11
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 5,975
Default Re: Bush DAC 90 or DAC 90A

Never seen one but was there a version of the DAC90 which employed B8A U40 series valves? Adaptor plates were used so that the B8A sockets fitted in the 1 1/8" holes in the chassis made for the octal valves.

DFWB.
FERNSEH is offline   Reply With Quote
Old 8th Feb 2020, 10:40 pm   #12
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 5,975
Default Re: Bush DAC 90 or DAC 90A

Quote:
Originally Posted by Ed_Dinning View Post
Hi Folks, I have seen at least 2, 90a sets where the octal punchings in the chassis had been plated over with an adapter for the B8A valveholders

Ed
Hi Ed,
while I was writing my previous post you confirmed that such a DAC90 does exist.

DFWB.
FERNSEH is offline   Reply With Quote
Reply

Thread Tools



All times are GMT +1. The time now is 7:16 am.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Copyright ©2002 - 2020, Paul Stenning.