Here is a good video on Youtube on how to bias a valve /Tube amp. It is a good introduction on what is involved for those with basic electric skills. How to Bias a Tube Amp Part 1 – YouTube.
How to Bias a Tube Amp Part 1 – YouTube Read More »
This weekend, I worked on a lovely 6 year old, Marshall DSL50 amp head. This was the unit I mentioned in a previous post that was awaiting my attention. It was working however the output valves were mighty hot. I checked the bias on those two beautiful EL34’s and found I could not adjust the bias below 68mA. They were running at 90mA when I first tested the amp. (Update Feb 2018 : we now
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Belcat 20R Service I had a Belcat Tube amp in my workshop. this was distorting but not in a nice way. It really made your ears hurt! This is a Fender Blues junior copy. The rectifier is solid state and there are three ECC83’s and the output is two EL84’s. I tested the valves on my tester just to make sure they were OK and they were perfect. I again replaced the output protection diodes
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Restoring Fender Deluxe Reverb Silverface or Blackface amp part 3 – resistors In common with all Fender amps they are mounted in the case “upside down” the valves hang at the bottom for east access. The trade off with this design is that heat rises so all the heat from the tubes/valves rises and it cooks all the components over time. A silver face amp is a minimum of 35 years old and so the
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VHT Special 6 Ultra Valve Amp I am currently working on a VHT Special 6 Ultra Amp. This is an amp head and this one has a 1 x 12 Goodmans greenback equipped close backed cabinet. This amp is only 5 watts. It makes a nice little practice/ bedroom/ studio amp where you can sound as if you playing through a fully cranked up Marshall 200 watt stack..great fun. These amps are very competitively priced
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Restoring a Fender deluxe reverb Part 2 Here is the next step in restoring the amp. On the underside of the chassis is the main board where the components are mounted. This is called the turret board. On my unit this board was covered in sticky nicotine tar and also it had mould on it ! I found the best way to clean this off was to use a Foam Cleanser that is used for
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Fender Deluxe Reverb Electronic Restoration I mentioned in an earlier post that I restored my 1971 Fender Deluxe Silver face Reverb’s electronics. Over the next few posts I am going to let you see how I did it. I hope this is useful information for you. The deluxe reverb, Twin reverb, Super reverb all have nearly the same design so what I am saying is true of all of these lovely amps. it also applies
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