Other Amps

NAD Masco ME-27 tube amp

1

Just picked this up today. An old Masco tube PA that I’m gonna rebuild. 25 watts, octal preamp, tube rectifier, three inputs. Has a flying lead output impedence selector. Super clean inside and out. 50’s Gibson style graphics. Gonna make a real cool guitar amp head.

2

Back in my Philadelphia days, we'd go to these scruddy old flea markets and buy cool old tube PA amps, Bogen/Masco/Stromberg and many others for damn near free and this friend back then made them into righteous little rigs for guitar and harmonica.

3

I've got a '49 and a '50 David Bogen PA heads. Yours looks much newer, cleaner, and it's more powerful. One thing that's nice about these old amps is that they've usually got a multi tap output transformer. The octal tubes are what's important tho. One sign of their age is the type of input connectors they have.

4

Nice! Any chassis shots?

8

Looks really clean! That should make for a great restoration. Does the phono input have more gain? It looks like you can convert the hum balance pot to a bias adjust.

9

I don’t have the schematic yet, but I’ll likely freshen it up a bit and see how it sounds.

10

Am I mistaken or does the tone pot have a push/pull function?

11

Not a push/pull function but a rotary power switch.

12

Very Interesting bit of kit.

13

Love those old octal tube amps,look forward to seeing how it turns out.

14

Just about done inside. I left CH1 stock and voiced CH2 like a Tweed Twin. Replaced the wax caps but left the molded ones in, see how they sound. New filter caps and R/C cathode network on the power tubes.

15

Replaced the old mic connections with 1/4” jacks. Kept the flying lead impedence selector.


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