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JDeV 26th February 2003 04:09 PM

Help - tube radio
 
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I got an old "Pilot" tube radio from a friend and want to know the following:
1) Where can I find a circiut for it?
2) What are the functions of selectors 1...6?
3) What impedance speaker can I connect to it?
4) What are the functions of connectors A...D?

Thanx for all help.

Here follow pic's of it:

JDeV 26th February 2003 04:10 PM

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Top:

JDeV 26th February 2003 04:12 PM

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Bottom:

Sch3mat1c 26th February 2003 04:14 PM

Dunno if there's antique radio buffs here, so if you have newsgroup access you should try alt.binaries.pictures.radio and the semi-associated non-binary group rec.audio.radio+phono.

Looks to me like it'd be quite a restoration...that chassis is completely covered in rust!

Tim

JDeV 26th February 2003 04:16 PM

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Rear:
What I also want to know is how to identify a tube with no markings? Tube ECH81 broke when I touched it, it was all white inside. Now I got a bag of old tubes, but some do not have any markings. There is 1 that look exactly the same , can I try it in this place?

Rear:

dhaen 26th February 2003 05:37 PM

The "valve with no markings" probably has got markings, underneath the screening sleeve, (it comes off). It is probably an ECC85 double triode, used as an FM tuner head, though I can't locate a detector.

Connectors, (first thoughts):

A: Aerial (antenna) and earth (ground). This is for AM.
B: Signal input from record (phono) deck.
C: Looks like HT (+B), and heater power for another unit.
D: Mains power for record deck.

The ECH81 has no subsitutes that I know of, other than (probably) a US equivalent number. I can't access info at present.
It is used as an oscillator (triodes section), and mixer (heptode section).

The EBF89 is used as IF amplifier and detector.

The ECL86 is the audio amplifier.

The EZ81 is the rectifier.

Send me some biltong if I'm right;)

316a 26th February 2003 05:46 PM

If the Valve is a Mullard / Philips / Valvo...
 
...it should have a small etch marking which will tell you the type number , year (not which decade) and factory it where it was produced . The first digits tell you the type number . Can you take a look and I'll check my list ?

316a

JDeV 26th February 2003 05:48 PM

Quote:

Originally posted by dhaen
The "valve with no markings" probably has got markings, underneath the screening sleeve, (it comes off). It is probably an ECC85 double triode, used as an FM tuner head, though I can't locate a detector....

Send me some biltong if I'm right;)


Thanx for info John
Any idea where I will connect poweramp or speaker on this unit?

dhaen 26th February 2003 06:03 PM

Hi Baz,

I could be wrong about connector D.
Trace the 2 wires from the output transformer, the one in the middle next to the tuning cap. They should come out on a connector; maybe D.

Cheers,

JDeV 26th February 2003 06:30 PM

Quote:

Originally posted by dhaen
Hi Baz,

I could be wrong about connector D.
Trace the 2 wires from the output transformer, the one in the middle next to the tuning cap. They should come out on a connector; maybe D.

Cheers,


The wires from the little transformer goes to connector C. Is this then for a speaker?
What impedance speaker will be O.K?
I have no experiance with tubes, so please excuse simple questions. :)


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