EB5AGV's Workbench: Collins 30L-1 restoration

A Classic Desktop Linear Amplifier

30L-1

This page will be devoted to my Collins 30L-1 amplifier restoration.

I got the unit uncomplete, after being stored for a long time. Luckily, it is missing some non essential parts, which I hope to find so the unit will come back to its former glory. I plan to match it with my KWM-2A and my S-line.


Unit as received

I got the unit very well packaged (thanks Jose Luis!) and, as I already knew, missing some parts.

It is a Round Emblem unit, serial number 27366, and from military origin, as one label in the rear panel shows.

Here you have some pictures of it:

30L-1

This is the pretty nice model label on the tubes cage cover:

30L-1

This is a top view, with tubes cover removed:

30L-1

And this is the serial number label, in very good condition for its age:

30L-1

These are some of the input filter coils:

30L-1

Some of the missing parts are a pair of plate caps and its corresponding parasitic suppressor. Only a couple are present:

30L-1

All internal parts seem to be in good shape:

30L-1

I hope the large power transformer is OK!

30L-1

These are the high voltage filter capacitors, which will need replacement:

30L-1

This is a bottom view, with cover removed:

30L-1

Tube ceramic sockets are also on pretty nice condition:

30L-1

30L-1

More nice looking components:

30L-1

30L-1

30L-1

This is the diode board:

30L-1

This power resistor is dated year 1968, week 22, when I was about two weeks old!

30L-1

Anothe close view of the bottom side components:

30L-1

The fan seems in pristine condition:

30L-1

Someday here there will be four 811A/572B tubes plugged!

30L-1

The meter glass is broken but the meter movement seems to be OK:

30L-1

This is a general view of the unit, upside down on the workbench. Front panel is in decent shape, with no big scratches. Cabinet is not in so good shape.

30L-1

So far, so good!. Now I need to locate the missing parts and then probably rebuild the rectifier/capacitor board.

As always, any hint regarding this restoration or where to find parts will be welcomed!


Parts needed

These are the parts I need to complete restoration:


More to come soon... keep tuned!


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