[EICO] Eico 666 help

[Percy Mistry]

Hi George, thanks for your reply. This should get me started.
9 or 10 revisions ?! Would you by any chance know where can I find the 
latest and greatest ?

I did a google search and found Antique Radio Forum 
(http://www.antiqueradios.com/) and will try posting there too. Also 
http://bama.sbc.edu/index.html is a good source for manuals and tube charts 
but I dont know if those charts are updated/corrected or not. Although I 
think for almost any tube tester once you figure out the switching you can 
make your own tube chart.

My main concern of asking about the values was to make sure changing the 
values does not affect measurements (conductance, emission) of the tube - or 
the transistor for the matter of fact.

The list is probably quiet because the default "reply to" is directed to the 
sender of the original email - and not to the list. You have to click "Reply 
All" instead or "Reply".

Pleased to know you are a fellow R-390'er too (qrz.com).

Thanks!
73s, KC0GVT.


----Original Message Follows----
From: "ks1u" <ks1u at prodigy.net>
To: "Percy Mistry" <pfmistry at hotmail.com>,<eico at mailman.qth.net>
Subject: Re: [EICO] Eico 666 help
Date: Fri, 25 Jun 2004 19:50:15 -0400

Percy:
     Hello and welcome to this fairly quiet list.  It's been awhile since I
played with the 666 but there are a few things I recall.  firstly, the roll
chart had quite a few errors and went through 9 or 10 revisions.  The filter
caps can be increased, but be sure not to exceed the maximum ratings for the
specified rectifier tubes.  You should be safe with 100pf but there isn't
much advantage to increasing their values well beyond there initial numbers.
Of course I would definitely replace any filter caps that are that old.  The
rectifier diodes can also be beefed up without much concern.  I don't recall
what the values of the 1n34 versus 1n48, but I'd make sure the values are
very close if not identical.  I wouldn't leave the unit on for extended
periods because heat build up in those testers can get quite high.
      That's about all I remember, you can probably do a search engine
request for the 666 and get quite a lot of info. There are still tons
(literally) of them out there.  Good luck.

George
KS1U

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