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-   -   Help - tube radio (http://www.diyaudio.com/forums/tubes-valves/11674-help-tube-radio.html)

dhaen 26th February 2003 07:38 PM

Connector C must be the one then. I was confused by the wire that runs from C to a valve, but now I see it actually goes to an earth tag.


There's probably no way of determining the speaker impedance, but I would guess at 4 ohms. 8 ohms would be fine too, but the power output would then be less.

JDeV 26th February 2003 07:46 PM

Re: Help - tube radio
 
Quote:

Originally posted by JDeV
I got an old "Pilot" tube radio from a friend and want to know the following:

2) What are the functions of selectors 1...6?

Thanx for all help.

Anybody have suggestions on the functions of these selctor buttons?
(See top of page, post#1)

EC8010 26th February 2003 07:47 PM

FM?
 
Are you sure it's FM capable?

There's only one tuning capacitor that I can see, and it would only be suitable from LW/MW/SW. To be able to tune VHF/FM, it needs a much smaller set of vanes of the variable capacitor, or perhaps slug tuning. Can we have a detail shot of the tuning capacitor? (It's the big vaned lump with the pulley and string.)

James D. 26th February 2003 07:50 PM

Hi John,

Quote:

There's probably no way of determining the speaker impedance, but I would guess at 4 ohms. 8 ohms would be fine too, but the power output would then be less.
I would have thought that a late fifties early sixties radio was most likely to be 15 or 16 ohms for an external speaker?

From memory, most of the ones of that vintage I worked on were that with some 12 ohm and some 8 ohm.

I saw very few 4 ohm until mid to late sixties...

maybe my memories wrong... what do you think?

James

dhaen 26th February 2003 07:53 PM

Buttons: I would guess that:

FM
Phono
Medium wave
Others are probably "favourite stations (MW).

EC8010: The FM tuning is in the tuner-head. Look at the depth of the box. The FM tuning might be "permeability tuning".

dhaen 26th February 2003 07:55 PM

James,

In fact my UK experience is almost the opposite:)
Most were actually 3 ohm, with some 15 ohm high quality stuff.

EC8010 26th February 2003 08:05 PM

Quote:

Originally posted by dhaen
The FM tuning is in the tuner-head. Look at the depth of the box. The FM tuning might be "permeability tuning".
I wondered about that, but couldn't see any string going below the variable capacitor.

JDeV 26th February 2003 08:07 PM

Re: FM?
 
2 Attachment(s)
Quote:

Originally posted by EC8010
Are you sure it's FM capable?

There's only one tuning capacitor that I can see, and it would only be suitable from LW/MW/SW. To be able to tune VHF/FM, it needs a much smaller set of vanes of the variable capacitor, or perhaps slug tuning. Can we have a detail shot of the tuning capacitor? (It's the big vaned lump with the pulley and string.)

I'am back. Here is another pic. The thingy behind the valve (is it valve or tube?) got 2 pieces on 1 shaft that can move upo and down.

dhaen 26th February 2003 08:08 PM

EC8010,

Top left of post 2 shows a silver looking drive wheel, I think:scratch:

dhaen 26th February 2003 08:10 PM

Beaten to it!

Yes, it's permeability:)

Tube = valve

Cheers,


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