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Old 26th February 2003, 04:09 PM   #1
JDeV is offline JDeV  South Africa
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Default Help - tube radio

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:
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Old 26th February 2003, 04:10 PM   #2
JDeV is offline JDeV  South Africa
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Old 26th February 2003, 04:12 PM   #3
JDeV is offline JDeV  South Africa
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Old 26th February 2003, 04:14 PM   #4
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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
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Old 26th February 2003, 04:16 PM   #5
JDeV is offline JDeV  South Africa
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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?

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Old 26th February 2003, 05:37 PM   #6
dhaen is offline dhaen  Europe
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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.

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Old 26th February 2003, 05:46 PM   #7
316a is offline 316a  England
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Default 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
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Old 26th February 2003, 05:48 PM   #8
JDeV is offline JDeV  South Africa
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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?
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Old 26th February 2003, 06:03 PM   #9
dhaen is offline dhaen  Europe
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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,
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Old 26th February 2003, 06:30 PM   #10
JDeV is offline JDeV  South Africa
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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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