This is an MRA5-L6 tube amplifier. These were HiFi amplifiers (Ultra-linear type) which came out of Seeburg Juke boxes in the USA from the 1950′s era. This one was re-tasked in the past to be a Guitar practice Amp in the USA, but it is just as readily a mono HiFi amp. The oddity about these is that their power transformer never had the facility to run the tube filaments, these were powered by a separate transformer in the Juke box. However this amplifier has had its power transformer replaced in the past with an American unit which does run the tube filaments. But it makes it a 115V line powered amplifier, fine for the USA but to run it here in AU you would need a 230v/115v step-down transformer from Jaycar. The type that passes the Earth through, so the chassis remains Earthed. Other interesting features, the amplifier has an optional automatic volume control, this was to level the volume of many different songs from 45 RPM records. The amp has had some parts replaced in the past, currently it has a good set of electrolytic capacitors. I powered it and played my guitar through it, it works with good sound output. It may require some future repairs, for example I can see that there are a few original capacitors that have not been replaced yet. Tube amplifiers, such as this, or any Tube guitar amplifier, have very high voltages inside, at least 400V as well as the line voltage and are dangerous. There is nothing dangerous on the top, electrically at least, though the tubes get quite hot. And as noted above, the chassis should be earthed.
Vintage Harmony Model H 400 tube guitar amplifier “TESTED & WORKING”. Here is one very good. Harmony Model H 400 3 watt tube guitar amplifier. Is complete and in ready to use condition! It is quiet (no hum). All tubes have been tested for shorts, emissions and grid leakage and all test very well. The cabinet is in good condition with very few cabinet blemishes and no major tears, the grill cloth is in good original condition! . The carry handle is also in very nice condition as shown! The whole unit seems all original with no modifications. It was missing the volume knob so I added one that fit. I have also cleaned the volume control which delivered noise free use at the time of testing! Take a really good look at the pictures and ask any questions you may have. You can find more information on this amplifier at.
Shows wear, age, patina, dings and scratches. Powers on and spins but not tested with a tape. Item has not been serviced. Each unit measures 18″x16.5″x9.5. Please view all photos. Zoom in on photos for a close-up view. Thank you for your support! We are a family-run business, and work hard to provide the best customer service possible. We will always do our absolute best to resolve an issue, and be honest and fair in any situation. It will be carefully packaged.
Excellent sounding vintage tube amp. Has built in reverb and tremolo. 12″ speaker and 8″ speaker. Has input for foot switch but switch broke. All vintage, all original parts. Has wear and tear from use, but otherwise in good condition.
I don’t know what brand or model amplifier this is. See pics, feel free to reach out with any questions you might have. There are four screws that hold the top case on.
