70's Fender Twin troubleshooting

[repeatanemic]

Apologize in advance if my terminology is vague due to lack of specific knowledge. I recently bought a 1970 Twin from a friend for a good price and went into...

[briguy1960]

I'"ve got a 73/74 fender twin. New output tubes and newish preamp tubes that work perfectly in my silverface super.
Doghouse caps replaced...

[bobloblaws]

I have a 68 Twin Reverb, AB763 circuit. The plate voltage is 460V. The target 70% max dissipation calls for about 45mA current per tube. When I turn up the...

[jeffects]

I've deferred starting this thread hoping to find an answer somewhere online and while it seems to be a common problem, I could find no suggestions that made...

[gromrock]

So I have been having issues with a 67 twin reverb (AB763). it had been eating fuses, each time it blew it was after about 10-15 minutes of playing it. I...

[TheeDoctor_G]

Hello,

I've recently become the proud owner of the Fender 65' Twin I bought it second hand and I am very pleased with it, it's in perfect...

[PfeifferElectronics]

My Twin Amp fell out the back of my rig onto the concrete floor. when I played it, everything seemed to be ok. Then I started hearing a crackling noise....

[gromrock]

This one is a doozy.....

The situation/problem:
-The volume on amp is on at least 3, perhaps 4.
-treb/mid/low are on "normal"...

[wvh_2000]

unit has 2 channels, one with vibrato. can't seem to find schematics anywhere and have been searching for the last ten years... does anyone know of anywhere...

[Spitfireb]

Well I'm in the process of building my own project amp. I found a old Mono amp on eBay and bought it so I had something to start with.
...

[Bradley]

Howdy all. I am new here, but I thought I'd give it a try. Here's whats happening. At first I would step on the vibrato foot switch and it would work for...

[deathofaparty]

Anyone know any good mods for a Fender '65 Twin Reverb Re-issue?

Thanks!

[shotgunvenus]

Hello all. I'm new to the forum. I'm not exactly an expert when it comes to amps or electronics, so maybe you can offer me a bit of wisdom!

...

[gregsk777]

Hi, I have a 135 watt silverface twin reverb and the ultralinear power transformer seems to get hot. After about 1 hour it gets warm and at about 1 1/2 hours...

[leejon]

The vibrato channel of my twin reverb has an unintential ugly distortion. Espacially on the low notes with the channel volume over 3. (guitar is directly...

[superfly]

I would like to build a 5d8 twin but I am having some trouble determining the correct size power transformer. Could someone offer some advice or info?...

[adam32790]

I was wondering what the difference between the old Fender "evil Twin" aka red knob and the current evil twin that Fender is selling. Is there a...

[adam32790]

I was wondering what the difference between the old Fender "evil Twin" aka red knob and the current evil twin that Fender is selling. Is there a...

[Metalmaster06]

My 1988 red knob twin is popping very loudly, even when at low volume, when any of the push pull pots are switched. There is some mild crackling when I twist...