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I need the owner's manual for Musical Fidelity Typhoon Preamp & Power amp. I NEED TO KNOW THE BRIDGING CONFIGURATION

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Posted on Jan 02, 2017

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SOURCE: Technics 1200 turntable - no

Technics 1200 - if the mains cord connectors and fuses are ok - it could be the power switch - when you rotate the switch do any lights come on? If it is just no rotation of the turntable platter then it could be the motor controller IC.

There is an internal regulator - often the associated zener and transistor fail.

Please rate this as a genuine cure - I know these inside out and with a bit more information I can give you a solution.

Posted on Mar 19, 2008

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Posted on Feb 26, 2009

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SOURCE: two terminals? bridging theory?

Hello again jm129852,

Having two power and ground terminals allows you to run two smaller wires instead of one big one. It's a convenience. No, you do not have to use them both. They are connected together inside. Yes, you should still use a single fused battery lead. Connect the big wire and fuse holder to the battery and to a distribution block and run the smaller wires from the output side of the distribution block.

When you connect the outputs of a two channel amp to two separate speakers, each speaker gets the power produced by it's channel only. If you are using only one speaker, and the amp is rated to operate bridged, then the speaker will receive the power from both channels, typically twice as much. You do need to be careful when using bridged mode because many amps will only operate safely at a higher impedance when bridged. For example, when operated with both channels connected to separate speakers (not bridged), it may be stable to 2 ohms. But when you connect both channels together (bridged), it is only stable to 4 ohms. Usually, the specifications will tell you the lowest impedance at which the amp should be operated. The specifications for the current RF Punch 500.2 are like this: 125 watts X 2 at 4 ohms; 250 watts X 2 at 2 ohms; 500 watts X 1 bridged at 4 ohms (4 ohm stable in bridged mode). You would NOT want to connect two 4 ohm subs in parallel to this amp in bridged mode. It would result in a final 2 ohm load and the amp would overheat and fail. One 4 ohm sub would be OK, and it would receive the full 500 watts as stated in the specifications. You could connect four 4 ohm subs, two each in parallel to each channel, and the 2 ohm loads on each channel would be OK. Or you could series two of them together for an 8 ohm load, do the same with the other two, and then parallel the two 8 ohm loads for a final impedance of 4 ohms and connect them into the bridged terminals. With DVC subs the connection possibilities get more complex. There are many good impedance calculators online that can help you determine the best wiring solution for various amp/sub combinations. I like the one above at web site. Rockford-Fosgate also has one which allow you to select the a number of subs (up to 4), their voice coil configuration (single or dual), and the voice coil impedance. The RF calculator then shows you what configurations are available and what your final load impedance will be.

Hope this helps.

Posted on Apr 28, 2009

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Posted on Feb 28, 2011

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SOURCE: Musical fidelity amp x-a2, one

This problem will occur when any one of the driver transistor is become faulty. You have to replace all the driver transistor of the same channel which make cracking sound . It is very difficult to tell which one is faulty. Because if you check the transistors with multimeter it will be ok. Replace all the driver transistor in that channel with same part number marked on it. The driver transistors will look like this,

ajin_g_6.jpg ok

Posted on May 20, 2011

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When i plug in to an amp i have no output

Check you battery and/or connections. You need to know in particular if the pickup wire is intact, and going to the volume/tone preamp. There would also be another wire going from the preamp to the plugin socket. If it uses a battery, check the power connections there. I hope this helps

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My Musical Fidelity Musical Fidelity XA-2 has suddenly lost some of it's depth and transparency of sound.

First is to check to make sure the power supply is putting out enough power.

From your description, it sounds like the classic signal "clipping" situation.

Since I tend to work from experience repairing a wide range of things, and I am not finding any references to your amp, not even in Russian sources, not even a picture, I have to make some assumptions for the moment, but this will help locate the problem.

Solder some test leads to an impedance matching transformer and the other winding to a plug that will fit your good headphones.

With chassis underside exposed, power up the amp, and apply a song you know well to the input. Use the test leads to check the 4558 IC's that are most likely to be found in the preamp stage(s) of the amp. and follow down the audio chain until you reach the power hybrids. If you happen to have the discrete transistors, those are better to work with and much easier to test.

If I am testing an amp in this way, I am listening for a dead spot, or a spot where the signal is very distorted. Being careful not to touch the power buss. Simply putting a test clip on one lead and attaching it to chassis ground is the easiest and fastest way to run through an amp.

if I am checking discrete transistors, I am just checking at the base lead of each one, or the gate if it is a FET until I find a distorted stage.

If you have power hybrid IC's, check at the website of the manufacturer of the IC for data sheets on that chip. Use those as a guide for checking voltages for the hybrid, as well as to help potential shorted components such as a capacitor or a resistor that may have failed.

If I know more details of the chips the amp uses, discrete transistors, or even if it happens to be a tube amp I can be much more specific.
Other things to check that are not always apparent- make sure there is a +15 colt supply and a -15 volt supply with respect to chassis ground when dealing with 4558 amp chips.

Feb 03, 2012 | Music

1 Answer

While playing, the power cord was accidentally pulled out. When plugged back in, the amp cuts on, but there is no sound and the led lights for peak and tone selection flash.

You have probably blown a tube. This amp has one 12ax7 and one 12au7 in the vintage preamp. You can try replacing the preamp tubes, but it can be quite dangerous if you don't know what you're doing!

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I have a caver preamp high fidelity control console model c- 4000 and I have a power amp.I don't know how to set it up to work thank you.

Can't find the manual.

Outs to Ins. Only connect a turntable to a PHONO connnector.

MAIN OUT to the unidentified amp's IN.

Don't slave too much power-hungry gear off the convenience outlets of the preamp.

Jun 29, 2011 | Audio Players & Recorders

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The amp power light comes on but there is no power / sound .

Do some tests: Plug a set of headphones into the line outs and tell us which ones if any have sound. Note that only one side of the headphones may have sound and it may be low volume. We need to know if anything is coming fromt he preamp. Makesure the output switch is set to one of the speaker on positions and not just phones.

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Hi, i need full electronic schematic GallienKrueger MB210 Amp Combo Bass, you have it?

See if this MIGHT be close...Power amp:

and preamp

Note this site will only allow two downloads per day without registering...

Scroll down to the link at the pages and click on "Get Manual"

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My spider line six 210 suddenly stopped working. When I turn it on, all the lights come on but no sound comes out except for an occasional crackle or pop. Please help. Thanks.

Could be a few things, is there a line out or preamp out on this thing? If there is run a patch cable into that and run that to another amp, power amp, guitar amp or if you don't have those wire up RCAs to one end of an instrument cable or get a 1/4 inch converter and run it to an aux on a home stereo. Just something to see if the preamp is working. If it is then your power section is dead, if you get no sound from the preamp then your preamp is dead. Let me know what you find. Also is there a warranty on it?

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Bridging Rockwood High Fidelity Car Amplifer

on the left channel (R+) on the right channel (L-) to create a bridge

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