Difference between revisions of "4A"
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The 4A was first introduced in the April-August issue of <i>Collins Signal</i> magazine. | The 4A was first introduced in the April-August issue of <i>Collins Signal</i> magazine. | ||
[[File:4A m.jpg|center|Its first appearance.]] | [[File:4A m.jpg|center|Its first appearance.]] | ||
| + | The production units were a bit different than the Museum's artifact. | ||
| + | The Power Amplifier Neutralization control was moved from the interior to the front panel. The crystal was moved from inside to a socket on the front. Notice this particular unit did not have a manufacturers plate - that we can see. | ||
Revision as of 00:06, 30 March 2020
This Amateur Radio Transmitter was introduced in the October 1933 issue of QST. It is a crystal-controlled CW-only transmitter capable of 20 watts RF output. The crystal and associated band-changing coils were plugged from the top of the unit.
The 4A was a kit, all parts included, however, you were responsible to purchase the tubes separately.
Construction
Like many home-assembled projects - this unit had no cover, top, sides or back.
As Advertised
The 4A was first introduced in the April-August issue of Collins Signal magazine.
The production units were a bit different than the Museum's artifact. The Power Amplifier Neutralization control was moved from the interior to the front panel. The crystal was moved from inside to a socket on the front. Notice this particular unit did not have a manufacturers plate - that we can see.
