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Countryman fet 85 - Countryman Type 85 Active Direct Box

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No output on the master but there are output on group and aus out

broken faders...bad muting fet on master buss, dirty insert jack on stereo buss...could be a lot of things, last drive stage to output, got hot neutral feedback on snake and blew the final stages...

Nov 13, 2013 | Peavey 16FX 16 Channel Mixer

1 Answer

Mackie Thump TH-15A speaker amplifier module

Jose Miguel Carcamo Cruces do you have pictures of these j112 fet ? Thank you!

Oct 07, 2013 | Mackie TH-15A Active DJ Powered THUMP...

1 Answer

Esquema eletrico behringer nu3000

I have a nu3000 that was linked in the wrong strength is 110volts

linked in 220volts burned the two fet source (transistor) T1 and T5 can someone tell me an equivalent for putting in place

Jun 13, 2013 | Music

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My son just bought a synsyter electric and has some fret buzz on the E-A-D-strings....I never use tremolo, so is action adjustment the first thing to try? Do you have a diagram of the saddle? He lives a...

One first has to find where the fet buzz is... that will point to the nut, the truss rod, or the bridge. There are a lot of videos on guitar setup on YouTube,,, He should NOT mess with the truss rod... that is for a professional to adjust.

Sep 13, 2011 | Schecter Synyster Standard Electric Guitar

3 Answers

Bought a used Mackie TH-15A. When powered up there is no all.

The internal amp is in need of repair. Are there any other symptoms or signs?

Feb 08, 2011 | Mackie TH-15A Active DJ Powered THUMP...

1 Answer

Loud static noise in drive channel. gets worse in more drive. Plays fine in clean channel. Drive channels do not seem to work. Amp is Hot Rod Deluxe 40W

The thing you can try is to swap tubes V1 and V2 which are 12AX7's... if major change occurs including loss of any signal, replace the one that WAS in V2 position.

More than this gets into the electronics and if you don't have test equipment it is not a DIY thing so you would need to take it to a shop. There are several components including FET's Q1 and Q2 and what looks like BAD engineering design around these particular parts that could cause the problem.
The bad engineering looks like tinkerers designed the circuit rather than an engineer. Gates of these FET's are left floating on the end of a 1N4148 diode according to my schematic... I have seen MUCH poor engineering or lack of in a lot of the audio equipment.

Dec 08, 2010 | Fender Hot Rod Deluxe Guitar Combo...

1 Answer

My guitar volume won't turn off

the problem i analyse is 1) the wires of the volume control (it has three wires wired to the input of the amplifier) wire 2 and 3 have got shortened.
2) the field effect transistor of the preamplifier has got shortened . the fet is in built in certain guitars.3) if its wire wound volume control then it has lost grounding , that is wire no 3 has lost its grounding (usually this is associated with a hum from the amplifier

Sep 19, 2009 | ESP Ltd EX-50 Electric Guitar

2 Answers

Behringer UB1222FX Pro: Problem With Left Channel Cutting Out

Try cleaning al of the sliders using an electronics cleaning spray. Choose one that contains a lubricant as well. Dirty sliders can cause this especially at low volume levels. If that does not resolve the provblem, update this and we'll look further.


Apr 09, 2009 | Behringer Music

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