Help - tube radio - Page 2

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

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

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

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

dhaen · 26th February 2003, 08:10 PM

Beaten to it!

Yes, it's permeability

Tube = valve

Cheers,

26th February 2003, 07:47 PM	#13
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	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.) __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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26th February 2003, 07:38 PM	#11
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	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.

26th February 2003, 07:53 PM	#15
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	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".

26th February 2003, 07:55 PM	#16
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	James, In fact my UK experience is almost the opposite Most were actually 3 ohm, with some 15 ohm high quality stuff.

26th February 2003, 08:08 PM	#19
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	EC8010, Top left of post 2 shows a silver looking drive wheel, I think

26th February 2003, 08:10 PM	#20
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	Beaten to it! Yes, it's permeability Tube = valve Cheers,

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