Marshall PA-20 Head 1917 Circuit 1973, Black
| Instrument | Amplifiers |
| Brand | Marshall |
| Model | PA-20 Head 1917 Circuit |
| Finish | Black |
| SKU | AP4047-A |
| Made In Year | 1973 |
| Preamp | 12AX7 (x2) |
| Power | EL84 (x2) |
| Rectifier | SS |
| Wattage | 20W |
| Circuit | 1917 |
| Transformers | Original Dagnall |
| PT | T2560 |
| OT | C2116 |
These amps don’t show up often, and it seems they were produced in fairly low numbers. You can think of this as a stripped-down, non-tremolo version of the Marshall 18W 1974 circuit, but in head form. The circuit is slightly different if you compare schematics.
Internally, two power resistors have been swapped, along with the cathode resistor cap for the EL84s. Also, 100 ohm screen grid resistors were added, which is a necessary addition for reliability. One bright cap was added across the blend resistor on one of the channels, but the rest of the preamp is original. See pictures for further details. The 8-ohm tap from the output transformer was also wired to the second speaker jack, with an embossed label added. This is a fantastic low-wattage amp that delivers a tone very reminiscent of a 20W version of a JTM45!
Similar Listings
Buying Through Carter Vintage
Yes, you can trade in your guitar at our shop and use the credit towards purchasing another guitar. We offer fair evaluations for trade-ins, making it convenient for you to upgrade or change your instrument while reducing the overall cost.
As a bonus, traded instruments will offset the taxable value of the sale. For example, if we offer you $1,000 for your guitar on trade towards a new one selling for $1,500, you would only owe tax on the remaining $500 balance.
We offer shipping for guitar purchases to your specified address. Once you’ve selected your guitar and completed the transaction, we’ll arrange for safe packaging and reliable delivery through trusted shipping carriers. You can also inquire about expedited shipping options for faster delivery.
A custom demo at our guitar shop is a personalized showcase of a specific guitar’s features, tone, and playability.
To get one, simply visit the product page of the item you’re interested in, click the Request a Demo Video button, and our expert staff will tailor a demo to your preferences, helping you make an informed decision.