29th Nov 2019, 1:39 pm | #61 |
Dekatron
Join Date: Nov 2009
Location: Lincolnshire, UK.
Posts: 5,000
|
Re: Dansette Conquest Auto
Excuse me for possibly stating the obvious, but why are you trying to alter the speaker wiring? It's the pickup wiring that's likely to be causing the hum, and certainly not the speaker wiring, which I would have thought could be left in place - unless I've missed something earlier on in the thread and there's been some other problem with this part of the circuit.
Personally, although I agree with what Edward says about the pickup wiring, I would first try to re-do that wiring to see if I could improve on it somehow. Properly screened and routed wiring 'should' be reasonably free from hum pickup. However, Edward may have already tried this in the past and found that there was no way of stopping the hum pickup other than completely removing the wiring and taking the output of the cartridge straight to the amplifier input, which, at the end of the day (as the saying goes) is the best option for minimal hum pickup. |
29th Nov 2019, 2:12 pm | #62 |
Rest in Peace
Join Date: Mar 2006
Location: N.W. Oxfordshire(Chipping Norton)
Posts: 7,306
|
Re: Dansette Conquest Auto
Donald, if you connect the leads from the cartridge to the red & black wires on the tag strip, all you then need to do is to solder a short length of wire between the red and blue wires. This connects the two channels of the cartridge in parallel, provided that all four terminals of the cartridge are connected to the tagstrip. Most BSR Autochangers of that era had four wires in the pickup arm, but two were tucked up near the back of the mono cartridge usually fitted. When fitting a stereo or stereo-compatible cartridge having 4 terminals, the two 'spare' wires must be connected to one channel of the new pickup, and the leads previously used to the other.
|
29th Nov 2019, 2:14 pm | #63 |
Octode
Join Date: Aug 2015
Location: Glasgow, UK.
Posts: 1,842
|
Re: Dansette Conquest Auto
Too late to Edit my Post #58 above which contains some confusing statements!
I said: - "I'm guessing (!) that I need to bridge the red and blue wires at the tag strip and these are the ones that need to connect to the cartridge or does one of the cartridge connections need to be the screen? Doubly confusing as the black and red wires are currently connected to the existing BSR TC8M cartridge?? The screens are already bridged at the tag strip." This should, I think, read: - "I'm guessing (!) that I need to bridge the red and blue wires at the tag strip and leave the black and red wires connected to the cartridge. The screens are already bridged at the tag strip." Or am I just confusing myself?
__________________
BVWS Member |
29th Nov 2019, 2:42 pm | #64 | |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
|
Re: Dansette Conquest Auto
Quote:
Lawrence. Last edited by ms660; 29th Nov 2019 at 2:47 pm. |
|
29th Nov 2019, 2:53 pm | #65 | |
Octode
Join Date: Aug 2015
Location: Glasgow, UK.
Posts: 1,842
|
Re: Dansette Conquest Auto
Quote:
So I can simply reconnect the grey co-axial from the volume control directly to the red and black wires on the tag strip - all other connections to the rear sockets removed. Speakers would need to be connected in parallel as a consequence? Apologies for labouring the point but I think we got there!
__________________
BVWS Member |
|
29th Nov 2019, 3:06 pm | #66 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
|
Re: Dansette Conquest Auto
Yes, but also be aware (if already not) that when two loudspeakers are used the wiring must be correct in terms of phasing...that's why the blue wire in the photo connects the red tag to the red tag on the loudspeakers, to that end it might be worth annotating the schematic you have to show that as a reminder if need be, just put a red + sign just above the top loudspeaker and a red + sign just below the bottom loudspeaker.
Lawrence. |
29th Nov 2019, 5:09 pm | #67 | |
Dekatron
Join Date: Sep 2015
Location: Southwold, Suffolk, UK.
Posts: 8,328
|
Re: Dansette Conquest Auto
Quote:
A Mk 2 version - just called Conquest - came later c.1965/66 and looked entirely different, with just one speaker and a stereo-compatible cartridge.
__________________
Edward. |
|
29th Nov 2019, 6:38 pm | #68 |
Dekatron
Join Date: Nov 2009
Location: Lincolnshire, UK.
Posts: 5,000
|
Re: Dansette Conquest Auto
|
29th Nov 2019, 7:07 pm | #69 |
Hexode
Join Date: Aug 2005
Location: Lincoln, Lincolnshire, UK.
Posts: 262
|
Re: Dansette Conquest Auto
Hi
The single valve was the ECL82, hence a two stage amp using a TC8M cartridge. |
29th Nov 2019, 8:47 pm | #71 | |
Dekatron
Join Date: Nov 2009
Location: Lincolnshire, UK.
Posts: 5,000
|
Re: Dansette Conquest Auto
Quote:
Regarding the broken arm hinge - monkey metal again unfortunately! There may be a way to repair that by making a small metal plate and bolting it together with very small nuts and bolts, otherwise it's going to be a case of fitting another deck - they often come up. There was a complete record player being offered on here a while back with no takers. |
|
29th Nov 2019, 9:10 pm | #72 |
Dekatron
Join Date: Nov 2009
Location: Lincolnshire, UK.
Posts: 5,000
|
Re: Dansette Conquest Auto
I've just dragged out one of mine to have a close look at the part and I reckon that if it were mine that had broken, then I'd find a way of repairing it with a little plate bolted on from below and reinforced with Araldite - it won't be easy, though.
Pictures of one of mine to show what it would have looked like before the break - making a mental note to myself to be careful when handling the pickup arms on these in the future:- |
29th Nov 2019, 9:23 pm | #73 |
Dekatron
Join Date: Nov 2009
Location: Lincolnshire, UK.
Posts: 5,000
|
Re: Dansette Conquest Auto
The record player I mentioned as being offered was FOC, but unfortunately 'collection only' which is fair enough, as posting and packing something like that can be a real pain. However, in post #9 of that thread it was mentioned about removing the cartridge and dumping the rest, which would have been a great shame. It looked in the end that there may have been some possible interest in the complete unit, although if it was going for scrap it would have had exactly the part/s you're looking for - it may be worth a polite PM to the person just asking what happened to it in the end
Link to that 'offered' thread below:- https://www.vintage-radio.net/forum/....php?p=1173821 |
1st Dec 2019, 10:40 pm | #74 |
Octode
Join Date: Aug 2010
Location: Beeston, Leeds, West Yorkshire, UK.
Posts: 1,234
|
Re: Dansette Conquest Auto
Hi.
It looks like you have a spring missing from the size selector, number 151 on the diagram. Check the cabinet or the tower where you took it from to see if it is still there. Gaz. |
2nd Dec 2019, 10:21 am | #75 |
Octode
Join Date: Aug 2015
Location: Glasgow, UK.
Posts: 1,842
|
Re: Dansette Conquest Auto
Many thanks Gaz
I'm assuming you mean Part No. 150 as shown on the schematic: - Not sure how the bottom lever of Part No. 84, the Selector Column Assembly, engages with the Switch Plate and springs but hopefully it will be clearer when I reintroduce the Size Selector meachanism?? Hopefully the relevant spring(s) are still in the vicinity! Back in Post #18 above I said "No wonder that BSR called the device a 'Magidisk' selector - I still need to satisfy myself as to how this mechanism connects underneath the chassis!"
__________________
BVWS Member |
11th Dec 2019, 2:53 pm | #76 | |
Octode
Join Date: Aug 2015
Location: Glasgow, UK.
Posts: 1,842
|
Re: Dansette Conquest Auto
Quote:
Having done the seemingly impossible in sourcing a replacement P.U. Hinge Assembly and successfully fitting that today I went back to installing a BSR X5M cartridge but for the life of me I can't remember/work out how to reassemble these parts: - Part A is the screw that holds the Spacer (Part 2) onto the Cartridge Housing (Part 1) - which way round and what order are these assembled? Part B is the screw that should hold the Cartridge Mounting Bracket (Part 3) onto the P.U. Arm but this doesn't fit into the hole - it does however fit the hole in the Cartridge (Part 4) itself but this doesn't seem very intuitive? All very frustrating ... hope someone can help?
__________________
BVWS Member Last edited by DonaldStott; 11th Dec 2019 at 3:19 pm. |
|
12th Dec 2019, 11:57 am | #78 |
Rest in Peace
Join Date: Mar 2006
Location: N.W. Oxfordshire(Chipping Norton)
Posts: 7,306
|
Re: Dansette Conquest Auto
That description is basically self-explanatory. As stated, these are what is known as 'compatible' cartridges -i.e. they will safely play both mono and stereo records. The rest of that means it has a single hole for fixing to the head of most autochange and single play decks (via a mounting bracket in most-if not all-cases, but it can also be mounted in a standard 0.5" headshell with two screws. These are crystal pickups having medium or high outputs, details of which should be in a 'sticky' thread about cartridges at the head of this section. However you may have difficulty obtaining a new working X5M or X5H cartridge by now
|
12th Dec 2019, 12:17 pm | #79 |
Octode
Join Date: Aug 2015
Location: Glasgow, UK.
Posts: 1,842
|
Re: Dansette Conquest Auto
Thanks for your response - my detailed query relates to the fact that although I have obtained a replacement BSR X5M cartridge (see pictures in my Post #76 above) I'm having problems fitting it to the tonearm?
The small screw that was used to attach the previous cartridge is slightly too large to fit the centre hole in the black fixing bracket - any idea what the diameter of this screw needs to be?? In addition, I need to reattach the Spacer onto the Cartridge Housing but cant remember the order or orientation of these parts?? Thanks in advance for any information.
__________________
BVWS Member |