James DeRosso makes really cool monster sculptures of all types, when he was visiting me one day a few months ago he saw my tube collection and he asked for a few old tubes, well here is the result if you would like to see some of his other monsters or if you want to commission your very own custom tube monster you can check out his website or blog here .
James DeRosso tube monster and a Miniwatt ECL 80
In case you are wondering – the amp is an 18watt el84 / 6bq5 Marshall Plexi clone with a ppmv and the guitar is a 1968 Gibson es335
here is a more normal monster without the tube 🙂
A Tubeless Monster by James DeRosso - awesome
Here are a few photos of my latest guitar project, a black face Princeton reverb. This amp will have a few upgrades from the original; it will have the following added features. Individual bias for each of the power tubes, and test points on the back of the amp to measure the bias current; since I didn’t have a power transformer with a 47v ac bias tap, I did with Jim Marshall did and am taking the b+ and dropping it to 47 volts before the ½ wave rectifier. This will give me the bias current needed to run the vibrato and keep the power tubes happy. The reason I can get away with this is because I have used a very large power transformer, this should reduce any sag in the bias voltage during high volume transients.
I will post a few sound clips when it is done.
Here are a few schematics and layouts incase you want to build your own
Princeton Reverb Schematic with a GZ34 – 5AR4 Rectifier
Princeton Reverb Schematic with a 5U4 Rectifier, this is the amp that I am building since I have quite a few 5U4 tubes laying around.
Well it is time to let go of some gear, and this is the first piece to go. we have a very vintage KAY from the late 30’s to mid 40’s since I can’t find another one anywhere on the web I have no way to date it.
What I do know is the following:
- The 6n6 tube was first manufactured in 1939 so the amp must be from after then.
- We have a field coil speaker which means that it was probably earlier than 1952 or so because that was when they were able to produce magnets that were strong enough and affordable for speakers
- The covering of the cabinet is made of the same stuff early aircraft were covered with
- The soldering was very well done so it is probably post war since there was a rather high demand for electronics after the war and there were a lot of trained electronics assemblers that needed work
If anyone knows any more about this very cool and good sounding amp please feel free to contact us.This small amp produces about 4 watts of power and has been restored and upgraded with new caps, and a 3 prong grounded cord. The buyer will receive the original caps and all the other “bad” parts that were removed during the restoration.