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Ships to:
United States
Ships to:
United States

Details about  Sound City 50 Plus guitar amp head with great tone! - hiwatt plexi el34

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Sound City 50 Plus guitar amp head with great tone! - hiwatt plexi el34
Item Sold
Item condition:
Seller refurbished

Seller serviced and sounding great

May 21, 2013 11:45:55 PDT
Winning bid:
US $530.00
19 bids ]
$50.00 Economy Shipping | See details
Item location:
Ames, Iowa, United States


eBay item number:
Seller assumes all responsibility for this listing.
Last updated on  May 11, 2013 11:47:23 PDT  View all revisions

Item specifics

Condition: Seller refurbished : Split the cost with friends
An item that has been restored to working order by the eBay seller or a third party not approved by the manufacturer. This means the item has been inspected, cleaned, and repaired to full working order and is in excellent condition. This item may or may not be in original packaging. See the seller’s listing for full details. See all condition definitions- opens in a new window or tab
Seller Notes: Seller serviced and sounding great

Sound City

Amplifier Type:



50 Plus

Country of Manufacture:

United Kingdom

This is an auction of a vintage Sound City 50 Plus guitar amplifier. It is difficult to determine the year of manufacture of this amplifier, however Dallas Arbiter began production of the 50 Plus in the early 1970s. Sound City's association with Hiwatt stems from Hiwatt's founder Dan Reeves having worked under Sound City from 1966-1968.

This 50 Plus is equipped with quality Partridge transformers. These definitely contribute to the amplifier's performance and tone. New filter capacitors have been installed as these components have a finite life span (20 years give or take, more longevity with regular use).

I purchased this amplifier in temperamental condition. The amp was randomly inserting volume spikes and popping. I was able to trace this issue to a plate resistor that was measuring over six times its intended value. On top of this I also spent some time cleaning up some of this amplifiers previous repairs as well as defeating the ground switch which is unnecessary with the three prong power cable.

The final product is an outstanding amplifier. Its controls are simple and effective. You will notice the tone controls work extremely well because this amplifier uses an active eq design vs the passive designs of Fender/Marshall/Vox. In this design a 12ax7 half is dedicated to amplifying one of the three eq bands. There is also a sensitivity/voicing switch behind the amplifier that allows you to increase or decrease the gain on the final preamp stage before the long tail pair phase inverter. This determines the amount of breakup to a degree. The tube layout is four 12ax7s and two el34s.

Other than eq this amp is a one knob amplifier. There is no master volume, so how loud and how much break up you get comes from the volume knob and your guitar. The cleans are very plexi-like and the overdriven tones have a hot rodded Marshall sound imo. The overall sound is very British.

The cons of the amplifier: I will say the carbon comp resistors throughout the amp add some ground level hiss. If these were to be replaced the hiss would clear up significantly, however many people desire the texture these resistors add to guitar tone. The amplifier is missing the top handle. Also, the amplifier is missing two knobs and the normal volume pot shaft has been broken. There is enough shaft to control the normal volume but the pot will need to be replaced in order to attach a knob.

International and low feedback must contact me before bidding
Good luck and happy bidding.

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