Dansette conquest turntable motor help

[Smt02tof]

So in reality I should be be counting anti-clockwise looking at the valve socket, I now understand
So taking into consideration the correct counting
1- 0 volts dc
2 - 0 volts dc
3 - 0 volts dc
4 - 0 volts dc 0 volts ac
5 - 7.1 volts ac
6- crackles and I get a reading but it’s soon 0
7- 0
8-0
9-0
Hope this makes some sense to someone
Thanks again for your assistance

[Smt02tof]

Originally Posted by snowman_al

A couple of thing are evident...
The pin numbering is clockwise from underneath the valve holder. That is pin 6 in reality.
You have your meter on AC volts. That is what the V~ symbol indicates. You need the V--- setting. The 1 reading on that location of the meter tells you it is out of range.

Thanks very much

[ms660]

Is that with the valve fitted or removed as in your photo?

Lawrence.

[Smt02tof]

Originally Posted by Smt02tof

Richard voltages are below
1- 650 ac 335 DC
2 0 ac 0 dc
3 788 ac 366 dc
4 818 ac 371dc
5 0 ac 0 dc
6 both 0
7 again 0
8 0/0
9 also both 0
Hope this helps

So now looking at this again
1-0 dc
2-0
3-0
4-0
5- 7.1v ac
7-0
8-0
9-0
I also used the yellow tester I have, the one I took the original values on appears to have died

[Smt02tof]

Originally Posted by ms660

Is that with the valve fitted or removed as in your photo?

Lawrence.

Valve removed

[ms660]

Originally Posted by Smt02tof

Valve removed

Best with the valve fitted then we won't have to remind you when measuring again once you've cracked the missing anode and screen voltages.

Lawrence.

[Smt02tof]

Right with valve in and it was a little awkward but double and triple checked, managed to remove the valve enough to get a clear connection on the pin
1- 0 v dc (Control grid of Triode)
2 - 43.9 v dc (Cathode of Pentode).
3- 0 (Control grid of Pentode)
4 - 0 (Heater)
5 - 5v ac (Heater)
6 - 348 v dc (Anode of Pentode)
7 - 332 v dc (Screen grid of Pentode)
8 - 4 v dc (Cathode of Triode).
9 - 273 v dc (Anode of Triode)
Cheers Lawrence

[ms660]

Measure the resistance between pin 2 and chassis and pin 8 and chassis (power off)

Lawrence.

[Smt02tof]

Is that With the valve in or out Lawrence, and do I need it powered up ?

[ms660]

Originally Posted by Smt02tof

Is that With the valve in or out Lawrence, and do I need it powered up ?

No power, you can leave the valve in.

Lawrence.

[Smt02tof]

Pin 2 - 98 ohms
Pin 8 - 9.8ohms
No difference either with or without power/ valve

[ms660]

98 Ohms or 98k? 9.8 Ohms or 9.8k? The triode's cathode bias resistor that's fitted looks like 10k to me, and the grid stopper resistor looks to be the wrong value.

Lawrence.

[Smt02tof]

Thought I would try all ways just in case

[ms660]

Originally Posted by Smt02tof

Thought I would try all ways just in case

Never try to measure resistance with the power on.

Lawrence.

[Smt02tof]

On the 200k scale the tab 2 is 98 which I would presume is 98k ohm
And on the same scale and tab 9.8 which would be 9.8k sorry had to re check myself I get ohms and k ohms mixed up

[Smt02tof]

That last post should read pin 8 - 9.8 on the 200 scale

[ms660]

Originally Posted by Smt02tof

On the 200k scale the tab 2 is 98 which I would presume is 98k ohm
And on the same scale and tab 9.8 which would be 9.8k sorry had to re check myself I get ohms and k ohms mixed up

Check the value of the resistors you've fitted with the values given in the D/T amplifier schematic for the relevant circuit positions.

Lawrence.

[Smt02tof]

Schematic is showing 10k ohm at 8 and 100 ohm at 2, I need to double check those resistances

[ms660]

Originally Posted by Smt02tof

Schematic is showing 10k ohm at 8 and 100 ohm at 2, I need to double check those resistances

The D/T schematic I'm looking at shows a 4.7k connected to pin 8 and a 100 Ohm connected to pin 2, and a 10k connected to pin 3.....

Any doubt about pin connections then you can refer to the valve data, here's the one for the valve in question, pin numbering as viewed from underneath:

http://www.r-type.org/pdfs/ecl82.pdf

Lawrence.

[Richardgr]

Those voltages look very high to me. Is there a possibility that the wrong tap was used on the mains transformer, so it is set to '120V', for example?

You are shooting for around 240VDC on the pentode anode/screen (pins 6 and 7 resp) (viewed clockwise from under the socket), and 10VDC on the pentode cathode (pin 2).