A Marshall JPM 50 arrives in the workshop. This blog covers this Marshall JPM50 Re-Commission. This Marshall JPM50 Amp is from the classic era of pre-1973 Marshall amps. It is therefore highly desirable when fully operational. The Marshall JTM50 on its last period of production, was re-branded as the Marshall JPM50. The amp went though final test at Marshall on 13th June. 1972. This is the highly desirable lead model from one of the […]
Note: We now have a new, superior solution to Marshall JCM2000 hum, noise, and bias drift issues. Find the details here. Marshall JCM2000 DSL100 Hum after warmup fix There are a couple of key problems with the Marshall DSL can TSL series printed circuit boards. One is the drifting bias due to board leaking current. This causes the EL34 output valves to overheat,We sell Stable bias board kits for the DSL and the
Folks ask me about how to make a 100 watt amp less loud. They want the amp “singing” but they need to have the output valves starting to clip and this means LOUD. Usually they are amps with outputs north of 60 watts. Exceptions are Vox AC30’s which are 30 watts. The discussion here is focused on amps that four or more output valves. First thing to keep in mind is that a 100 watt
180 day warranty on valves ! If you in North America substitute the word valves for tubes ! We have looked at many websites that sell valves/tubes and we found that the warranty was mentioned nowhere on the site or buried on the website. The warranty was in many cases very stingy. We now offer a 180 day warranty on all the valves we sell. We are completely upfront and you will see the
Most folks are just not sure when should you change your valves? Valves do wear out. How do I know? We need explanation of how they wear out and what to look for. Then you will know when to replace them There is a lot of stuff written on forums on why tubes valves wear out. There is a lot of confusion. Here is an example of the confusion on one typical forum . I
We have been working on Faster Shipping with more options to improve our service in these challenging times We now can ship to Italy Greece again and have much faster shipping options for Canada, USA and the rest of the world! We have been experiencing the UK post to be much slower within the UK and is becoming very slow for example to the USA. We have seen first class post take 9 days
6V6 and 6L6 output valves Valves are ancient technology. Over 100 years old. Many folks expect the reliability of modern electronics like an Iphone. However, the reliability and the lifespan of old technology is much less than modern electronics. We al love the sound of valves and this this the trade off. Two really common audio output valves are the 6L6 and the 6V6. Very commonly used in American amps. They came on to the