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Old 8th November 2004, 10:35 AM   #1
GeirW is offline GeirW  Norway
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Default Hello again, plus a couple of Q`s.

Gday.

Ciao. everyone, am back to eventually learn some more.
Have been abroad for some time, (Sicily - working)
Am still haven`t got around to make my pp el84, still
collecting parts. And regarding that i have a couple of questions,

1. There was a guy that gave me a old Tanberg amp/radio.
am gonna build another, but i think am going to change
some components in this one. (i think this is from 57-58)
apparently it uses ecc83 to drive el84, what`s the equalent
of ecc83, or is it a good tube. (telefunken).

2. To everyone known to tanberg stuff.
Is it someplace on net, i can read up on the transformators
used in there models. (they don`t have any labeling.
just that it`s rosses metal/covered in "tar".
(fecking heavy)


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Old 9th November 2004, 05:52 PM   #2
GeirW is offline GeirW  Norway
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Gday.

Q.1. over at duncan amps, 12AX7 is mentioned as a
equalent tube. No modding needed?
How will it sound, atm. there`s one ecc83 on 2 x el84.
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Old 9th November 2004, 06:34 PM   #3
SY is offline SY  United States
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ECC83 is just the European equivalent number for a 12AX7. Same same.
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Old 9th November 2004, 07:49 PM   #4
GeirW is offline GeirW  Norway
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Gday.

OK. is there some other options.?
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Old 9th November 2004, 07:55 PM   #5
SY is offline SY  United States
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12AX7s are common, inexpensive, easy to get, and easy to apply. What else are you looking for?
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Old 9th November 2004, 08:34 PM   #6
GeirW is offline GeirW  Norway
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Gday.

Well. for that 75-20 in question, i think i better change
most of the caps and resistors in signal path,
since the amp. itself are quite old. I reckon they have gone
bad after 47 years. (the caps. are Hunts, not sure about the res.)

Regarding the tubes, i just is exploring the option
of replacing them. You say 12AX7 is the same as ecc83,
and i reckon the 6BQ5 is equivalent of el84?.

I am on the look out for one particular though,
It`s a big DC cap. (tread in the electrical parts)
(printed on the can.)
Red res. 40uF 350v
Max Ripple 350MA
Yellow 20uF 350v
Blue 10uF 350v
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Old 9th November 2004, 08:45 PM   #7
SY is offline SY  United States
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Yes, 6BQ5 and EL84 are the same thing. And are also cheap, plentiful, and good quality.

You might consider doing the restoration in stages. Replace the electrolytic caps, input and output jacks, potentiometers, and any selenium rectifiers, then see how it all works. Next in line would be coupling caps, then resistors.
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Old 9th November 2004, 09:21 PM   #8
GeirW is offline GeirW  Norway
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Gday.

Quote:
stages
yes. i have to, no matter what, it`s a mess in there.
one at a time.
btw. there isn`t used jacks, just pipes to put the banana inn.
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Old 9th November 2004, 11:32 PM   #9
EC8010 is offline EC8010  United Kingdom
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You definitely want to replace those "Hunts" capacitors. The bodies tended to crack and let moisture in, making them leaky. A leaky coupling capacitor could destroy a perfectly good EL84.
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Old 10th November 2004, 12:18 AM   #10
mcs is offline mcs  Denmark
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Yes, I have seen those Hunts in Danish radios also - they are terrible! I also have a Tandberg 64 full of them waiting to be restored...

And conc. the ECC83. If you already have a Telefunken ECC83 there, you wont be able to find a better tube - just leave it. If the EL84s are Philips, Telefunken, Valvo etc. they are great also. You can try buying some new ones, but the old ones may turn out to be better.

Best regards,

Mikkel C. Simonsen
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