Comments for page: Eico Cortina 3070

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Posted by Max H March 26, 2012 - 01:16 am
Tuner now perfect. After some use, AFC was in and out - traced to a cold solder. Thank goodness too, really didn't want to have to open RF stage.

Found a box of #49 lamps. Stereo indicator works properly now. Took apart tuning meter and glued scale back in place with contact cement. It was loose and causing needle to bind.

Very happy with the 3200 and 3700. Next time I order from Mouser will get some low noise transistors for line stage of 3700 as per your mod, it would be nice to kill the hiss completely.

Another useful mod, would be to make the loudness control boost treble less, it appears to follow an outdated curve which has excessive treble boost compared to modern loudness controls, and it limits its usefulness.

Posted by Max H March 18, 2012 - 06:34 pm
I hope the 2N2219A holds up too. I will eventually do some more modifications to the amplifier, but for now am just happy to have it working again. This little amp really packs a punch - with my Realistic Mach One speakers, it has more than enough power. I've noticed it gets fairly warm after it's been operating for a while.

I replaced all of the many electrolytic capacitors in the 3200 tuner today. With a pair of rabbit ears it's picking up all the local stations with great fidelity. AFC works too. The "stereo" indicator light was burned out, and I replaced it with the wrong bulb, so it's too dim now. Also, the tuning meter doesn't work, so I'm not done yet.

Thanks for taking the time to put all this info online, it motivated me to refurbish my old tuner and amp, with excellent results.

Posted by Steve L. March 18, 2012 - 12:56 pm
Hi Max, Congratulations on restoring your Cortina! It's great that you were able to find suitable replacements for the drivers nearby. There is a lot to be said for using something that's handy. In a cursory glance, those seem like good choices.

The only thing I might carp about would be the 40V max rating of the 2N2219A. I have measured the power supply as high as 45V. When the output swings low, the NPN driver can see almost the full supply voltage. However, I would expect production transistors to exceed their specs, so it should work fine in practice.

Please keep us posted on the Cortina tuner progress. Good work!

Posted by Max H March 18, 2012 - 03:30 am
Cortina is back in service, after many years. I ended up using 2N2905A and 2N2219A matched as drivers on one side, because they were what I could find locally. TO-66 outputs from Surplus Sales date code 1980. Other side all transistors original. Replaced all electrolytic capacitors. New thermal grease, cleaned controls, etc.

Amplifier sounds good. Going to take better care of it this time, tuner is next.

Posted by Max H February 25, 2012 - 08:06 pm
Hi Steve -I sent you an email. Let me know if it didn't go through.

Posted by Steve L. February 24, 2012 - 02:33 pm
Hi Max, Yes, the good ol' 667 should do the job. I used to use that transistor test function before I bought the Peak unit. Will be interested to see the pix. I hope that you will post a link. BTW, my email address is on the About page. May I have yours?


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