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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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25th Jan 2021, 7:54 pm | #81 |
Pentode
Join Date: Nov 2020
Location: Skidby, East Riding of Yorkshire, UK.
Posts: 210
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Re: Dansette conquest turntable motor help
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 |
25th Jan 2021, 7:57 pm | #82 | |
Pentode
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Location: Skidby, East Riding of Yorkshire, UK.
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Re: Dansette conquest turntable motor help
Quote:
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25th Jan 2021, 7:59 pm | #83 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Dansette conquest turntable motor help
Is that with the valve fitted or removed as in your photo?
Lawrence. |
25th Jan 2021, 8:03 pm | #84 | ||
Pentode
Join Date: Nov 2020
Location: Skidby, East Riding of Yorkshire, UK.
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Re: Dansette conquest turntable motor help
Quote:
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 |
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25th Jan 2021, 8:24 pm | #85 |
Pentode
Join Date: Nov 2020
Location: Skidby, East Riding of Yorkshire, UK.
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Re: Dansette conquest turntable motor help
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25th Jan 2021, 8:26 pm | #86 | |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Dansette conquest turntable motor help
Quote:
Lawrence. |
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25th Jan 2021, 8:59 pm | #87 |
Pentode
Join Date: Nov 2020
Location: Skidby, East Riding of Yorkshire, UK.
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Re: Dansette conquest turntable motor help
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 |
25th Jan 2021, 9:11 pm | #88 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Dansette conquest turntable motor help
Measure the resistance between pin 2 and chassis and pin 8 and chassis (power off)
Lawrence. Last edited by ms660; 25th Jan 2021 at 9:21 pm. Reason: extra info |
25th Jan 2021, 9:13 pm | #89 |
Pentode
Join Date: Nov 2020
Location: Skidby, East Riding of Yorkshire, UK.
Posts: 210
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Re: Dansette conquest turntable motor help
Is that With the valve in or out Lawrence, and do I need it powered up ?
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25th Jan 2021, 9:22 pm | #90 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
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Re: Dansette conquest turntable motor help
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25th Jan 2021, 9:25 pm | #91 |
Pentode
Join Date: Nov 2020
Location: Skidby, East Riding of Yorkshire, UK.
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Re: Dansette conquest turntable motor help
Pin 2 - 98 ohms
Pin 8 - 9.8ohms No difference either with or without power/ valve |
25th Jan 2021, 9:37 pm | #92 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
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Re: Dansette conquest turntable motor help
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. Last edited by ms660; 25th Jan 2021 at 9:43 pm. Reason: extra info |
25th Jan 2021, 9:37 pm | #93 |
Pentode
Join Date: Nov 2020
Location: Skidby, East Riding of Yorkshire, UK.
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Re: Dansette conquest turntable motor help
Thought I would try all ways just in case
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25th Jan 2021, 9:45 pm | #94 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
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Re: Dansette conquest turntable motor help
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25th Jan 2021, 9:53 pm | #95 |
Pentode
Join Date: Nov 2020
Location: Skidby, East Riding of Yorkshire, UK.
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Re: Dansette conquest turntable motor help
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 |
25th Jan 2021, 9:56 pm | #96 |
Pentode
Join Date: Nov 2020
Location: Skidby, East Riding of Yorkshire, UK.
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Re: Dansette conquest turntable motor help
That last post should read pin 8 - 9.8 on the 200 scale
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25th Jan 2021, 10:00 pm | #97 | |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
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Re: Dansette conquest turntable motor help
Quote:
Lawrence. |
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25th Jan 2021, 10:18 pm | #98 |
Pentode
Join Date: Nov 2020
Location: Skidby, East Riding of Yorkshire, UK.
Posts: 210
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Re: Dansette conquest turntable motor help
Schematic is showing 10k ohm at 8 and 100 ohm at 2, I need to double check those resistances
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25th Jan 2021, 10:23 pm | #99 | |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
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Re: Dansette conquest turntable motor help
Quote:
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. Last edited by ms660; 25th Jan 2021 at 10:37 pm. Reason: Extra info and added link |
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25th Jan 2021, 10:38 pm | #100 |
Heptode
Join Date: Oct 2019
Location: Täby, Sweden
Posts: 702
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Re: Dansette conquest turntable motor help
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). |