SOLD - Vintage Harmony Valco Model 8418 THC Amp – USA 1950s

by Harmony Valco

$995.00 21149


This is a very cool early 1950's Harmony 8418 THC amplifier in fantastic working condition.

The innocence and simplicity of 1 control and 3 tubes = GREAT sound. All original with the exception of 2 newer capacitors, with a couple of very old (possibly original ?) valves.

Tube configuration is as follows: 1 x 5Y3, 1 x 6V6, and 1 x 6SJ7 through the original 6" Speaker. This amp appears to be all original except for the 3 prong power cable & 2 caps mentioned above.

Original Specs –

Model: Harmony 8418 THC

Supplier - Sears, Roebuck & Co. Chicago
Year: 1950 ?
Category: Guitar Amplifier
Valves / Tubes - 6SJ7 6V6GT 5Y3GT
Power type and voltage - AC) / 60 cycle, 110-117 Volt 
Two Input Jacks
Volume Control with On-Switch
Loudspeaker - Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / 6 inch = 15.2 cm
Power out - 5 W (max.)
Material - Leather / canvas / plastic
Dimensions (WHD) - 305 x 380 x 220 mm / 12 x 15 x 8.7 inch
Weight - 4.9 kg / 10 lb 12.7 oz (10.793 lb)

The original leather handle is broken & held together (only just) with some gaffa tape underneath.

Its original transformer is in place so you’ll need a small stepdown transformer for use in Oz.

Most student and entry-level amps from the 50s were abused, mistreated, or poorly stored, so it is extremely rare to find an example this clean and original. And how good is the very funky silhouette of a hollow body guitar on the grill cloth ?

You can spend a lot of $$$ on a tweed amp from this same era, or get practically the same sound from this little gem for a fraction of the cost.  

Nice and clean down low, but crank it a little and it goes all thick & creamy with rich harmonic overtones – a fabulous recording amp.

Fully tested and ready to go!


If you would like to know more about an item or buy it, please click on "I'm interested" on the product page or call John on 0414 994 506


Payment preference for purchases is by direct bank deposit (EFT). Credit cards, Paypal or bank cheque acceptable upon request. We also sell with Lay By - 25% deposit + 90 days to pay


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