Ultra T401 drive cord issue. - UK Vintage Radio Repair and Restoration Discussion Forum

Bazza1975 · 9th Apr 2016, 3:45 pm

Hello everyone,

I'm trying to get my Ultra T401 working but although the string is tight the middle tuning knob doesn't turn it. Is there some method to get more friction on the either the string or knob ?

Cheers

Baz

vinrads · 9th Apr 2016, 4:06 pm

Make sure all the pulleys are free to turn including the tuning cap ,how many turns do you have on the tuning spindle ? a picture would be a help , Mick.

Nuvistor · 9th Apr 2016, 4:07 pm

Have you confirmed the dial is strung as per the manual and that the tuning gang and any item in tbe dial cord path are not stiff to turn?

cross post, but same thoughts

David G4EBT · 9th Apr 2016, 7:44 pm

You don't say whether you have the Maker's data sheet, which includes instructions on re-stringing the drive cord. If not, you can get the data at the top right for £1.99.

As dial cords go, the T401 is quite simple - from the dial drum, clockwise twice round the tuning control spindle (which gives 1.5 turns), then to the right of the idler wheel and left around the drum to meet up with the start of the cord, where the ends should be tied off on the tension spring to take any slack out of the cord. If the tuning capacitor, drive spindle and idler wheel all turn freely, the most likely cause of an slipping is insufficient tension on the spring.

Hope that helps a bit.

9th Apr 2016, 3:45 pm	#1
Bazza1975 Retired Dormant Member Join Date: Apr 2016 Location: Gosport, Hampshire, UK. Posts: 1	Ultra T401 drive cord issue. Hello everyone, I'm trying to get my Ultra T401 working but although the string is tight the middle tuning knob doesn't turn it. Is there some method to get more friction on the either the string or knob ? Cheers Baz

9th Apr 2016, 4:06 pm	#2
vinrads Dekatron Join Date: Feb 2009 Location: Chesterfield, Derbyshire, UK. Posts: 3,766	Re: Ultra T401 drive cord issue. Make sure all the pulleys are free to turn including the tuning cap ,how many turns do you have on the tuning spindle ? a picture would be a help , Mick.

9th Apr 2016, 4:07 pm	#3
Nuvistor Dekatron Join Date: Aug 2013 Location: Wigan, Greater Manchester, UK. Posts: 9,433	Re: Ultra T401 drive cord issue. Have you confirmed the dial is strung as per the manual and that the tuning gang and any item in tbe dial cord path are not stiff to turn? cross post, but same thoughts

9th Apr 2016, 7:44 pm	#4
David G4EBT Dekatron Join Date: Feb 2003 Location: Cottingham, East Yorkshire, UK. Posts: 5,765	Re: Ultra T401 drive cord issue. You don't say whether you have the Maker's data sheet, which includes instructions on re-stringing the drive cord. If not, you can get the data at the top right for £1.99. As dial cords go, the T401 is quite simple - from the dial drum, clockwise twice round the tuning control spindle (which gives 1.5 turns), then to the right of the idler wheel and left around the drum to meet up with the start of the cord, where the ends should be tied off on the tension spring to take any slack out of the cord. If the tuning capacitor, drive spindle and idler wheel all turn freely, the most likely cause of an slipping is insufficient tension on the spring. Hope that helps a bit. __________________ David. BVWS Member. G-QRP Club member 1339.