Dansette Conquest auto mk2 (Actually a mk1). - Page 5 - UK Vintage Radio Repair and Restoration Discussion Forum

Station X · 14th May 2016, 1:04 pm

Only if you connect 2200 of them in series!

'LIVEWIRE?' · 14th May 2016, 1:06 pm

I hope the OP isn't planning to replace a 220k resistor with either a 1k (220 times too low a value) or even worse, an 100 ohm (2200 times too low a value) one. The correct value must be fitted

Skintin · 14th May 2016, 1:18 pm

Haha...maplin here i come once the wife gets in!
Graham thank you very much for your patience and my inept experience. You and the rest of the members are a credit this forum. To the rest of the guys who have made comments thank you to you too.

I will respond later once the chauffeur gets home and purchase the merchandise from maplin.

Again Thank You for all your help

Tom

peter_sol · 14th May 2016, 1:21 pm

You need a 220K ohm 1/4 watt resistor
If they do not have that a 180K ohm at 1/4 watt will be just fine.
Nothing else.
Good luck with it.

Skintin · 14th May 2016, 1:25 pm

just going to purchase a quantity of various resistors peter

E3 Resistor 480 Piece Pack

High-quality carbon film resistors with a connecting wire that is easily soldered. This pack contains 30 of each of the following values:10Ω, 22Ω, 47Ω, 100Ω, 220Ω, 470Ω, 1KΩ, 2K2Ω, 4K7Ω, 10KΩ, 22KΩ, 47KΩ, 100KΩ, 220KΩ, 470KΩ & 1MΩ

at least if the hoover blows up i will have spares!

Station X · 14th May 2016, 1:26 pm

Or either of those values in a higher power rating.

Edward Huggins · 14th May 2016, 2:18 pm

Why do you need all these - maybe there are many more record players waiting for repair? Edward

GeoffK · 14th May 2016, 4:00 pm

The positive side of the rectifier is dangerously close to the chassis, shouldn't really have to state that the unit should be switched off and the smoothing capacitor allowed to discharge before attempting to move the tag.

Skintin · 14th May 2016, 4:52 pm

hi guys back from my day trip to maplin.

replaced the resistor with 220k 1/4 watt.

now when i switch the unit on and start to turn up the volume, the small transformer sizzles when the volume is touched. and almost sounds like its going to fry

Edward Huggins · 14th May 2016, 5:02 pm

Careful, that's the output transformer having a severe voltage problem - I wonder if it's getting a high voltage on its secondary via the feedback loop - which would not be good news for the (2) speakers? You really do seem to be struggling with this. Why not call one of us in? Edward

Station X · 14th May 2016, 5:33 pm

Are you actually trying to play a record?

Any sound from the speakers?

Skintin · 14th May 2016, 5:47 pm

no graham not yet...just tried and getting sparks from the small transformer

Skintin · 14th May 2016, 5:48 pm

still nothing from the speakers either!

Sideband · 14th May 2016, 5:52 pm

Quote:

Originally Posted by Skintin

now when i switch the unit on and start to turn up the volume, the small transformer sizzles when the volume is touched.

Have you got the loudspeaker connected? If you haven't this will cause the output transformer to make a noise when the volume is high and can damage the transformer due to the generation of high voltage which can cause sparking (I'm trying to keep it simple). Make sure the speaker is connected and the connections are good. As a note, you should never run a valve amplifier without a speaker connected.

Skintin · 14th May 2016, 6:05 pm

yeh they seem to be...no lose wire hanging anywhere

GeoffK · 14th May 2016, 6:07 pm

The enamel insulation on the transformer looks cooked, is it touching the frame. And do something with that rectifier tag before it shorts, with the power switched off.

Station X · 14th May 2016, 6:12 pm

The wire will be sparking either because there's a break in it, in which case the spark will be between the broken ends of the wire, or current is flashing over to the transformer frame.

Check for breaks in the wire and gently move it away from the frame. You don't want to break the enamelled wire.

You replaced C3 64uF which is part of the feedback loop. Is it the right way round?

Has R5 been refitted correctly with good soldered joints?

peter_sol · 14th May 2016, 6:17 pm

That is why we had intermittent voltages at the pentode anode.

peter_sol · 14th May 2016, 6:20 pm

I often wish we lived nearer to some of these long posters because a small hand close by would help them to enormously and relieve both our and their fustration.
Unfortunately when help was offered by someone recently it was accompanied by a fee.

Skintin · 14th May 2016, 6:33 pm

checked the connections and the 64uf is in the right way round

14th May 2016, 1:04 pm	#81
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Dansette Conquest auto mk2 (Actually a mk1). Only if you connect 2200 of them in series! __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

14th May 2016, 1:06 pm	#82
'LIVEWIRE?' Rest in Peace Join Date: Mar 2006 Location: N.W. Oxfordshire(Chipping Norton) Posts: 7,306	Re: Dansette Conquest auto mk2 (Actually a mk1). I hope the OP isn't planning to replace a 220k resistor with either a 1k (220 times too low a value) or even worse, an 100 ohm (2200 times too low a value) one. The correct value must be fitted

14th May 2016, 1:18 pm	#83
Skintin Retired Dormant Member Join Date: Jan 2016 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 124	Re: Dansette Conquest auto mk2 (Actually a mk1). Haha...maplin here i come once the wife gets in! Graham thank you very much for your patience and my inept experience. You and the rest of the members are a credit this forum. To the rest of the guys who have made comments thank you to you too. I will respond later once the chauffeur gets home and purchase the merchandise from maplin. Again Thank You for all your help Tom

14th May 2016, 1:21 pm	#84
peter_sol Octode Join Date: Aug 2003 Location: Welwyn Garden City, Herts. UK. Posts: 1,906	Re: Dansette Conquest auto mk2 (Actually a mk1). You need a 220K ohm 1/4 watt resistor If they do not have that a 180K ohm at 1/4 watt will be just fine. Nothing else. Good luck with it.

14th May 2016, 1:25 pm	#85
Skintin Retired Dormant Member Join Date: Jan 2016 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 124	Re: Dansette Conquest auto mk2 (Actually a mk1). just going to purchase a quantity of various resistors peter E3 Resistor 480 Piece Pack High-quality carbon film resistors with a connecting wire that is easily soldered. This pack contains 30 of each of the following values:10Ω, 22Ω, 47Ω, 100Ω, 220Ω, 470Ω, 1KΩ, 2K2Ω, 4K7Ω, 10KΩ, 22KΩ, 47KΩ, 100KΩ, 220KΩ, 470KΩ & 1MΩ at least if the hoover blows up i will have spares!

14th May 2016, 1:26 pm	#86
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Dansette Conquest auto mk2 (Actually a mk1). Or either of those values in a higher power rating. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

14th May 2016, 2:18 pm	#87
Edward Huggins Dekatron Join Date: Sep 2015 Location: Southwold, Suffolk, UK. Posts: 8,327	Re: Dansette Conquest auto mk2 (Actually a mk1). Why do you need all these - maybe there are many more record players waiting for repair? Edward

14th May 2016, 4:00 pm	#88
GeoffK Heptode Join Date: Mar 2016 Location: Essex, UK. Posts: 602	Re: Dansette Conquest auto mk2 (Actually a mk1). The positive side of the rectifier is dangerously close to the chassis, shouldn't really have to state that the unit should be switched off and the smoothing capacitor allowed to discharge before attempting to move the tag.

14th May 2016, 4:52 pm	#89
Skintin Retired Dormant Member Join Date: Jan 2016 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 124	Re: Dansette Conquest auto mk2 (Actually a mk1). hi guys back from my day trip to maplin. replaced the resistor with 220k 1/4 watt. now when i switch the unit on and start to turn up the volume, the small transformer sizzles when the volume is touched. and almost sounds like its going to fry Attached Thumbnails

14th May 2016, 5:02 pm	#90
Edward Huggins Dekatron Join Date: Sep 2015 Location: Southwold, Suffolk, UK. Posts: 8,327	Re: Dansette Conquest auto mk2 (Actually a mk1). Careful, that's the output transformer having a severe voltage problem - I wonder if it's getting a high voltage on its secondary via the feedback loop - which would not be good news for the (2) speakers? You really do seem to be struggling with this. Why not call one of us in? Edward

14th May 2016, 5:33 pm	#91
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Dansette Conquest auto mk2 (Actually a mk1). Are you actually trying to play a record? Any sound from the speakers? __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

14th May 2016, 5:47 pm	#92
Skintin Retired Dormant Member Join Date: Jan 2016 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 124	Re: Dansette Conquest auto mk2 (Actually a mk1). no graham not yet...just tried and getting sparks from the small transformer Attached Thumbnails

14th May 2016, 5:48 pm	#93
Skintin Retired Dormant Member Join Date: Jan 2016 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 124	Re: Dansette Conquest auto mk2 (Actually a mk1). still nothing from the speakers either!

14th May 2016, 6:05 pm	#95
Skintin Retired Dormant Member Join Date: Jan 2016 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 124	Re: Dansette Conquest auto mk2 (Actually a mk1). yeh they seem to be...no lose wire hanging anywhere Attached Thumbnails

14th May 2016, 6:07 pm	#96
GeoffK Heptode Join Date: Mar 2016 Location: Essex, UK. Posts: 602	Re: Dansette Conquest auto mk2 (Actually a mk1). The enamel insulation on the transformer looks cooked, is it touching the frame. And do something with that rectifier tag before it shorts, with the power switched off.

14th May 2016, 6:12 pm	#97
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Dansette Conquest auto mk2 (Actually a mk1). The wire will be sparking either because there's a break in it, in which case the spark will be between the broken ends of the wire, or current is flashing over to the transformer frame. Check for breaks in the wire and gently move it away from the frame. You don't want to break the enamelled wire. You replaced C3 64uF which is part of the feedback loop. Is it the right way round? Has R5 been refitted correctly with good soldered joints? __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

14th May 2016, 6:17 pm	#98
peter_sol Octode Join Date: Aug 2003 Location: Welwyn Garden City, Herts. UK. Posts: 1,906	Re: Dansette Conquest auto mk2 (Actually a mk1). That is why we had intermittent voltages at the pentode anode.

14th May 2016, 6:20 pm	#99
peter_sol Octode Join Date: Aug 2003 Location: Welwyn Garden City, Herts. UK. Posts: 1,906	Re: Dansette Conquest auto mk2 (Actually a mk1). I often wish we lived nearer to some of these long posters because a small hand close by would help them to enormously and relieve both our and their fustration. Unfortunately when help was offered by someone recently it was accompanied by a fee.

14th May 2016, 6:33 pm	#100
Skintin Retired Dormant Member Join Date: Jan 2016 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 124	Re: Dansette Conquest auto mk2 (Actually a mk1). checked the connections and the 64uf is in the right way round Attached Thumbnails