Dansette conquest turntable motor help

[theredhouseinn]

Connect the blue to neutral. connect one red wire to the brown and the other red to the line. Now you have to get the two windings in phase. one way round the red winding will be out of phase with the main winding, the other way it will be in phase. one way to check this is to connect your avo meter on ac current in series with the line and the connection to one red wire. one way round the current will be lower than the other way. The low current way is the in phase connection.
Be careful. a 230 volt shock livens you up a bit, makes you curse, upsets the wife.
John.

[Smt02tof]

Thanks John
I will attempt this tomorrow, so if you don’t hear from me I’ve most probably blown myself up ��

[John10b]

I’ll be interested how you get on.
John

[Smt02tof]

Originally Posted by John10b

I’ll be interested how you get on.
John

Hi John thanks very much for your support on this, yesterday I connected the wires as you suggested and it worked first time, correct speed and power, so as this was just a 3 speed motor I interchanged the armiture from my old motor, this also worked, so 4 speeds all appear to be correct, your advice is much appreciated, now on to finishing to amp

[Smt02tof]

Hi all I have taken onboard the suggestions regarding the caps, I have re fitted on the footprint to make a neater job

[Edward Huggins]

Do you mean the printed circuit board?

[Smt02tof]

Yes Edward, happy new year to you and all the forum members

[Smt02tof]

Hi all
Turntable absolutely spot on now but having real issues with the amplifier, I thought the best way would be change all the resistors but now I get a very distorted tone, the hum has gone but not sure what is causing the distortion issues
I have changed the smoothing can for 3 separate caps 2 X 33s and a 24 this cured the initial hum, I moved mains transformer to the rear of the case which improved things, any help would be great I have attached an image of the Finnished amp let n my e know if anyone can see a glaring mistake, I may have followed the circuit diagram incorrectly, but on top of this I have now misplaced my paperwork with values and replace the values ���� the 4 large blue resistors are 100k the biscuit brown are 4.7k, the yellow cap is 0.015 uf , the amp is D/T
Thanks in advance

[ms660]

For starters, the pentode's cathode and grid stopper resistors look the wrong value to me unless I'm mistaken.

Triode's cathode bypass capacitor polarity?

I would check for all the correct values and your work.

The D/T schematic I'm looking at has only one 100k resistor.

Lawrence.

[Edward Huggins]

What promted you to replace all of the resistors? If you are not sure of their values, then this could make a huge difference in distortion levels and the wrong DC voltages. You can source a circuit from the above "Service Data" Link and check their values. Moving the mains TX seems a bit drastic, so do make sure this is as far away as possible from the pick-up tagstrip under the deck plate.

[Smt02tof]

I thought it would be best to replace the resistors due their age, the record player appears to have had a hard life and I would prefer not to have strip it down again.
I do have a diagram, but to be honest I got a little confused reading it, it would be a great help if someone could tell me the supposed values from left to right on the photo, I did test every one and wrote down the values then looked for the best replacement.
This was done but I have now lost the paperwork.

[Smt02tof]

Originally Posted by ms660

For starters, the pentode's cathode and grid stopper resistors look the wrong value to me unless I'm mistaken.

Triode's cathode bypass capacitor polarity?

I would check for all the correct values and your work.

The D/T schematic I'm looking at has only one 100k resistor.

Lawrence.

Well I just tested the old ones and tried to get the nearest replacement ie
The first on the left tested 80k so I replaced with 100k

[ms660]

Originally Posted by Smt02tof

it would be a great help if someone could tell me the supposed values from left to right on the photo

So far as I can make out......(per the D/T amplifier schematic):

Left to right.....100 Ohms...18 Ohms...18k...330k...0.01uF...100k...10k...100 Ohms.

The capacitor across the bottom...25uF +ve to the cathode of the triode.

The values above are the values shown on the D/T amplifier schematic that I'm looking at.

Any errors then guilty as charged.

Lawrence.

[Smt02tof]

Originally Posted by ms660

So far as I can make out......(per the D/T amplifier schematic):

Left to right.....100 Ohms...18 Ohms...18k...330k...0.01uF...100k...10k...100 Ohms.

The capacitor across the bottom...25uF +ve to the cathode of the triode.

The values above are the values shown on the D/T amplifier schematic that I'm looking at.

Any errors then guilty as charged.


Lawrence.

Lawrence

Thanks very much will try that and see how it goes 👍

[ms660]

Regarding that layout, it might be worth waiting to see what the rest of the gang come up with.

Lawrence.

[Cobaltblue]

I found this on the net at livinginthepast-audioweb

Most of the resistor values can be read the Cap is not in the pictures which helps.

The board is the other way around so to compare it to Lawrence's list you need to look right to left

Cheers

Mike T

[Ed_Dinning]

Hi, this can be a trap for the unwary . Resistors normally increase in value with age, so replacing a one that reads 80K with a 100K resistor is likely to be going the wrong way.
You need to find a colour code table then decipher that. Then check with your meter, ideally with one side of the resistor lifted in case there are parallel paths that can give false readings. If resistor is within 10% it will normally be OK.

This seems a bit of a long procedure but when you have done a few sets it becomes second nature and is pretty quick.

Ed

[theredhouseinn]

I agree with ed.
You must learn the resistor colour code in order to replace the out of tolerance resistors with ones of the correct value.
Black-0, brown-1, red-2, orange-3, yellow-4, green-5, blue-6, violet-7, gray-8, white-9.
So, reading from the end where the coloured bands are closest, if the 3 colours are say, brown, red, red, this would give you 1,2, and 2 noughts, 1200 ohms, or 1.2k.
You cannot repair vintage amps unless you know this code.
John.

[Smt02tof]

Thanks everyone, one issue was the colours had rubbed off, but got a starter for 10 here, I’m in no rush so will take my time
Your all a great help

[Smt02tof]

Originally Posted by theredhouseinn

I agree with ed.
You must learn the resistor colour code in order to replace the out of tolerance resistors with ones of the correct value.
Black-0, brown-1, red-2, orange-3, yellow-4, green-5, blue-6, violet-7, gray-8, white-9.
So, reading from the end where the coloured bands are closest, if the 3 colours are say, brown, red, red, this would give you 1,2, and 2 noughts, 1200 ohms, or 1.2k.
You cannot repair vintage amps unless you know this code.
John.

Thanks John this is a great help