Denco coils - UK Vintage Radio Repair and Restoration Discussion Forum

zaxanoid · 15th May 2014, 11:29 am

Don't know if anyone out there can help with this...

I am trying to finish some radio projects I started many years ago, which are based on Denco coils.

I have searched fairly hard to try and purchase the extra bits I need, but can't find exactly what I need....looks like I'll be winding some!

The coils I am looking for are the Denco T range.
I have found specs for the DP range (and I can even find DP coils to buy)

The question is how to the DP coils compare to the T coils?
And does anyone have the specs for the T range?

HamishBoxer · 15th May 2014, 12:03 pm

Best iIIIIIII can suggest apart from Googling is put an Advert in the Wanted section.

bc312 · 15th May 2014, 12:47 pm

This link - http://markhindes.easywebstore.co.uk...archTerm=denco, shows some T coils for sale.
Regards

bc312 · 15th May 2014, 12:57 pm

Some more info here - http://vintageradio.me.uk/info/dencodtb4_data.htm.

kellys_eye · 15th May 2014, 8:42 pm

As I understand the ranges the T (transistor) and DP (dual purpose) are fully interchangeable. The inductance values would (naturally) be identical between the types but the type of wire used may differ (double cotton-covered for higher voltages perhaps?)

Anyway, spec on the ranges can be found here:

http://vintageradio.me.uk/info/dencocoils.htm

G8HQP Dave · 16th May 2014, 12:21 pm

The transistor range will presumably have low impedance base coupling windings which the valve DP range will lack. The oscillator coils will need quite different coupling windings. The main tuned winding may be identical.

zaxanoid · 16th May 2014, 6:31 pm

Thanks folks. From the links above, I can see that there is a significant difference between DP and T range. I have trawled the web buying some of my missing T range coils, will have to keep a lookout for the rest (or have a go at winding).
BTW the set I am most keen on finishing is a David Gibson superhet.... I am sure it can be made to work, and trying some 38yrs ago, got me hooked on radio - even though it never worked.

jim_jobe · 16th May 2014, 7:36 pm

See attached if you want to wind your own, and, also: https://www.vintage-radio.net/forum/...d.php?t=106027
Jim

zaxanoid · 18th May 2014, 10:37 pm

Thanks Jim, this is going to help!
I am trying to make the T range coils, I have the red (2,3,4), blue (4) and yellow (2,4).
I am fairly sure the table at the top is the Blue range, and the lower table (oscillator) is the Red range? If I am right, then does anyone know about the Yellow ones?

15th May 2014, 11:29 am	#1
zaxanoid Diode Join Date: May 2014 Location: Guildford, Surrey, UK. Posts: 4	Denco coils Don't know if anyone out there can help with this... I am trying to finish some radio projects I started many years ago, which are based on Denco coils. I have searched fairly hard to try and purchase the extra bits I need, but can't find exactly what I need....looks like I'll be winding some! The coils I am looking for are the Denco T range. I have found specs for the DP range (and I can even find DP coils to buy) The question is how to the DP coils compare to the T coils? And does anyone have the specs for the T range?

15th May 2014, 12:03 pm	#2
HamishBoxer Dekatron Join Date: Aug 2007 Location: W.Butterwick, near Doncaster UK. Posts: 8,932	Re: Denco coils Best iIIIIIII can suggest apart from Googling is put an Advert in the Wanted section. __________________ G8JET BVWS Archivist and Member V.M.A.R.S

15th May 2014, 12:47 pm	#3
bc312 Pentode Join Date: Feb 2005 Location: Longfield, Kent, UK. Posts: 240	Re: Denco coils This link - http://markhindes.easywebstore.co.uk...archTerm=denco, shows some T coils for sale. Regards __________________ Leave me alone - I know what I'm doing. BVWS member, EUG, G-QRP Radio Bygones/Radiophile

15th May 2014, 12:57 pm	#4
bc312 Pentode Join Date: Feb 2005 Location: Longfield, Kent, UK. Posts: 240	Re: Denco coils Some more info here - http://vintageradio.me.uk/info/dencodtb4_data.htm. __________________ Leave me alone - I know what I'm doing. BVWS member, EUG, G-QRP Radio Bygones/Radiophile

15th May 2014, 8:42 pm	#5
kellys_eye Octode Join Date: Jan 2014 Location: Oban, Scotland, UK. Posts: 1,129	Re: Denco coils As I understand the ranges the T (transistor) and DP (dual purpose) are fully interchangeable. The inductance values would (naturally) be identical between the types but the type of wire used may differ (double cotton-covered for higher voltages perhaps?) Anyway, spec on the ranges can be found here: http://vintageradio.me.uk/info/dencocoils.htm

16th May 2014, 12:21 pm	#6
G8HQP Dave Rest in Peace Join Date: Sep 2008 Location: Solihull, West Midlands, UK. Posts: 4,872	Re: Denco coils The transistor range will presumably have low impedance base coupling windings which the valve DP range will lack. The oscillator coils will need quite different coupling windings. The main tuned winding may be identical.

16th May 2014, 6:31 pm	#7
zaxanoid Diode Join Date: May 2014 Location: Guildford, Surrey, UK. Posts: 4	Re: Denco coils Thanks folks. From the links above, I can see that there is a significant difference between DP and T range. I have trawled the web buying some of my missing T range coils, will have to keep a lookout for the rest (or have a go at winding). BTW the set I am most keen on finishing is a David Gibson superhet.... I am sure it can be made to work, and trying some 38yrs ago, got me hooked on radio - even though it never worked.

18th May 2014, 10:37 pm	#9
zaxanoid Diode Join Date: May 2014 Location: Guildford, Surrey, UK. Posts: 4	Re: Denco coils Thanks Jim, this is going to help! I am trying to make the T range coils, I have the red (2,3,4), blue (4) and yellow (2,4). I am fairly sure the table at the top is the Blue range, and the lower table (oscillator) is the Red range? If I am right, then does anyone know about the Yellow ones?