Amp Talk Blog On Guitar Amp Repair | ValveTubeGuitarAmps

JJ Electronic 12BH7-A Brand New Valve from JJ Electronic !

A new valve has entered production. The JJ Electronic 12BH7-A has been introduced. It has been in development for a good number of months and now first production is being released. One other supplier has been making new 12BH7’s but were always difficult to get into stock. So the JJ electronic 12BH7 -A version is a welcome addition from a trusted European valve manufacturer. We are official authorised dealers for JJ Electronic. We have the […]

JJ Electronic 12BH7-A Brand New Valve from JJ Electronic ! Read More »

An Orange Tiny Terror is shouting again

I received an Orange Tiny Terror for repair. It had lost its voice ! I had never worked one of these amps so an exciting new experience. It is built into a nice metal case and is a very conventional circuit using two ECC83’s and two EL84’s in the output. Here is a picture of the amp opened up and the picture below shows the printed circuit board construction. I found it quite funny to

An Orange Tiny Terror is shouting again Read More »

Sickly Marshall JCM900

A Marshall JCM900 amp arrived. The JCM900 combo is basically a 100 watt twin 12 inch speaker combo and is a true Marshall stack in a matchbox. Nice and easy to transport. When new these amps supplied in two variants, with one having 4x EL34’s in the output and the other variant having slightly lower power with 4x 5881’s. This amp was dead. Zero output and a lovely hum. Inside the amp proudly displayed

Sickly Marshall JCM900 Read More »

What Mains Voltage do I set my vintage amp on ?

In the “old days” UK mains voltage was 240 volts AC and Ireland plus mainland Europe was 220 volts AC. With the tolerances back in those old days UK mains voltage could be as high as 264 volts AC, so running an amp that was set for 220 volts AC in the UK could mean that the amp was being run at 20% over voltage. That means your valves have a heater voltage that is

What Mains Voltage do I set my vintage amp on ? Read More »

Fender 65 Deluxe Reverb Bespoke Valve Kit

Making it easier to find your valves

We have been working to make it easier to find products in our shop. We have increased our product a lot over the past year and I was finding it difficult enough to find products on our website, so I am sure it was harder for you ! We have made a number of improvements. If you click on the categories picture on the front page, this opens up a set of selections. Here is

Making it easier to find your valves Read More »

Mesa Boogie Amp Repair

A very sick Mesa Boogie Caliber DC 10 amp arrived for me to have a look at. Our first Mesa Boogie Amp repair. This one had one dead channel and my 22 watt Fender Deluxe was as loud as this amp. The Mesa Boogie is a 100 watt amp so something was up. It also sounded naff. Mesa’s have a reputation of being complex and difficult to repair. I had never seen inside one but

Mesa Boogie Amp Repair Read More »

More New Valves July 2016

We have introduced more new valves which are all now in stock. We now have the more specialised valves that are used in Ampeg and Peavey guitar amps. The Electro Harmonix 12DW7 ( also known as the ECC832) is a double triode and in this valve one half is like an ECC83 ( 12 AX7) with a gain of 100 and the other half like an ECC82 ( 12AU7) with a gain of 20. Peavey