Search results

The "VA" rating is simply the Volt x Amp rating of the power use. It is very similar to watts but there is some phase shift in the current voltage orientation and power factor. VA is said to be the true power rating. This really does not concern us. So If your amp is 120 volt and has a 3 amp...

The "VA" rating is simply the Volt Amp rating of the power use. It is very similar to watts but the is some phase shift in the current voltage orientation and poeer factor. VA is said to be the true power rating. This really does not concern us. So If your amp is 120 volt and has a 3 amp fuse...

One of the tell tale attributes of the MkIiA is the ability to swap V1 preamp tube with a solid state FET device they called a Fetron. And to Id this feature you will find a toggle switch on the undersIde of the chassis near the preamp tubes. This feature I am pretty sure was unique to the MkllA...

One of the tell tale attributes of the MkIiA is the ability to swap V1 preamp tube with a solid state FET device they called a Fetron. And to Id this feature you will find a toggle switch on the undersIde of the chassis near the preamp tubes. This feature I am pretty sure was unique to the MkllA...

Recently did a repair on an older 20-20 amp (about 10 yr) and found some of the circuit had been altered on the newer models. I will outline the changes made as they are what is on the only current available schematic. 1) input downstream of 4k75 schematic shows 10k & 47k to ground and older...

Does anyone of my Boogie Brothers have any idea who makes the brown 1% 5 band 1/2 w metal film resistors were used in the amps about 10 years ago. Have a 20-20 to update to the latest schematic and that means I need 4 330K and 1 56K to replace some 220K and a 47K5. Turns out the red plating on...

Have a friends 20-20 here with a tube issue. First, anyone with an accurate schematic or know where to get it? Second, I looked at the amp a while back and what it did was after 15 or so minutes V6 (el84) would glow bright red like a shorted tube. Changed out and suggested he order a new round...

I have a 79 MKII-B that was a 60-100RG/EV that the factory did a conversion on to a MKII C+ Simul Class but that was many years ago when I had the work performed. I had the conversion done in 1985 and it cost me $485 at the time, but this included recovering the case with new tolex and a new...