Dent & Johnson electric gram turns up. - UK Vintage Radio Repair and Restoration Discussion Forum

murphyv310 · 25th Apr 2009, 3:31 pm

I have just aquired a Dent & Johnson of Linwood Gram with amp from the late twenties.
I have two amps a speaker and a turntable (wind up) with a BTH p/u, sadly no sign of the Dent & Johnson original arm and p/u.

I did a thread a few months ago about his p/u, HMV bought out the patent for the p/u in the early 30's. I have all the letters from Mr Johnson to the Gramophone company and the replies, so this is a nice find to have the equipment as well.
I am going to wire it all up later and see if it works.
Cheers
Trevor

Herald1360 · 26th Apr 2009, 1:52 pm

Would the big knob with "Raise Pitch" have been a speed control for an electric motor driven turntable? It seems rather hidden away to be a tone control.

Chris

murphyv310 · 26th Apr 2009, 7:58 pm

Quote:

Originally Posted by Herald1360

Would the big knob with "Raise Pitch" have been a speed control for an electric motor driven turntable? It seems rather hidden away to be a tone control.

Chris

Hi Chris.
Quite possibly, the set up here though is a wind up turntable with a magnetic pick up head. There was a model produced though with an AC motor and it may have had electronic control.
I didn't have time though this weekend to work out the connections and check it out, perhaps next weekend.
Cheers
Trevor

chipp1968 · 2nd May 2009, 6:34 pm

Interesting .looks in good condition. does it work ?

murphyv310 · 3rd May 2009, 10:52 am

Quote:

Originally Posted by chipp1968

Interesting .looks in good condition. does it work ?

Hi Chipp.
It does work, the interstage transformer was o/c but a rummage in the loft found an identical replacement. The speaker I have though is rough but the chap who had it has another that is mint.
Its quite loud but a little down on bass responce which due the type will be correct.
I will be handing the whole lot back in a week or two after its all tidied up, he wants to put it up for sale along with all of the original documentation about the patent and letters from the Gramophone Company.
Its been nice to fix and really quite good to see (hear) a piece so early working again.
Cheers
Trevor

25th Apr 2009, 3:31 pm	#1
murphyv310 Dekatron Join Date: Sep 2006 Location: Kilmarnock, Ayrshire, UK. Posts: 5,422	Dent & Johnson electric gram turns up. I have just aquired a Dent & Johnson of Linwood Gram with amp from the late twenties. I have two amps a speaker and a turntable (wind up) with a BTH p/u, sadly no sign of the Dent & Johnson original arm and p/u. I did a thread a few months ago about his p/u, HMV bought out the patent for the p/u in the early 30's. I have all the letters from Mr Johnson to the Gramophone company and the replies, so this is a nice find to have the equipment as well. I am going to wire it all up later and see if it works. Cheers Trevor Attached Thumbnails __________________ Cheers, Trevor. MM0KJJ. RSGB, GQRP, WACRAL, K&LARC. Member

26th Apr 2009, 1:52 pm	#2
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,536	Re: Dent & Johnson electric gram turns up. Would the big knob with "Raise Pitch" have been a speed control for an electric motor driven turntable? It seems rather hidden away to be a tone control. Chris

2nd May 2009, 6:34 pm	#4
chipp1968 Rest in Peace Join Date: Jul 2006 Location: Somerset, UK. Posts: 2,356	Re: Dent & Johnson electric gram turns up. Interesting .looks in good condition. does it work ?