This page is my attempt to correct the general lack of schematics and technical information about Hiwatt amplifiers. One hand-drawn set of schematics has been widely circulated, and published in both Pittman and Weber's books, and a few Audio Brothers schematics have been seen in …

Click the link above for Tube amp info, Schematics, Board building information, Projects, Mods, Transformer diagrams, Photo's, Sound clips. There are hundreds of pages of Tube amp information on my library page.

2022年11月5日 · Preamp Tube/Valve Locations. Later amps used 12AX7/ECC83 in all locations, but this is the "classic" configuration for all DR504, DR103 and DR201 amps:

Schematic of the power amp. Schematic of the PSU. Check out the HiWatt Story for more information on the HiWatt tube guitar amps. HiWatt UK is worth checking out too. See Mark Huss’s excellent HiWatt site for a lot more technical information.

2013年4月29日 · I am planning a DR103 build and have started on a layout using DIYLC. So far I am at the end of the preamp and just wanted to check a few things before I progressed any further.

2012年5月4日 · My layout visually is based on the picture of (AFAIK) real Jimmy Page Hiwatt that can be found online. All I had is that picture, and Mark Huss @ hiwatt.org schematic. - R20 is hidden by big e-capacitor, and it’s hard for value verification. On Mark’s schematic it is 47k/2W.

2025年1月3日 · I redrew the Hiwatt Custom 20 Tube schematic too. I might have posted it before, but I think this one is a bit more finished and makes a lot more sense now for someone who might want to build it.The Hiwatt lead 20 is also very similar to it.

2024年1月7日 · I've been playing around with a Hiwatt DR504 clone which I modded to have a SAP preamp with an early 70s style phase inverter, i.e., with the cathode follower carrying the signal rather than just providing bias for the phase inverter (links to schematics below).

Here is an example of a Hiwatt PA head, DR203 Model "PA", 6 x EL34. The front view; The output tubes; The chassis. Pictures courtesy of John L.

Building on the Hiwatt Custom 20, this amp offers the Artist even more possibilities for great tone. Use the 40 watt ‘Stage’ mode when you need clean headroom and volume. Drive the amp harder in the 20 watt ‘Studio’ mode when you want to hear the pure, natural tube overdrive that made Hiwatt famous. Pull the