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How to change Roland VGA7 guitar amp batteries?

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Posted on Jan 02, 2017

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SOURCE: ROLAND GR30 POWERS UP BUT DOES NOT MAKE A SOUND

Make sure you use the ORIGINAL AC adapter with the unit. It takes a 9VAC one.

The adapter for the GR09 will NOT work and will act the way your unit is acting.

Posted on Oct 06, 2009

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SOURCE: Roland AC-60 Amp input impedances ?

I will solve the mystery...

The impedance varies depending on how you connect. It would be too complicated to explain the impedance to the average person.

From the schematic we have the TRS 1/4 inch jack having basically 100K and parallel 220 pf cap to ground EACH signal line and 10K resistance between. (The TRS jack if used disconnects the XLR and its components)

If one uses the XLR jack, one has an ADDITIONAL 100K each side in parrallel to ground PLUS an ADDITIONAL 2.2K resistor shunting between.

In ADDITION to the above, there is effectively 160K ohms to ground each side that is the input resistance to the input OP-AMP.

The effective impedance will depend on how and where you measure it.

Not sure what peizo you are using... For one on wife's violin we go into a X2 wireless which has about 1.6 Megohm. The receiver of course is fairly low impedance drive to the amp.

For the violin (Autolycus) pickup and others, severe distortion of the waveform existed when run directely into most amps and of course long cables worsened it at the high frequencies.

Posted on May 20, 2010

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1 Answer

ROLAND GR30 POWERS UP BUT DOES NOT MAKE A SOUND


Make sure you use the ORIGINAL AC adapter with the unit. It takes a 9VAC one.

The adapter for the GR09 will NOT work and will act the way your unit is acting.

Oct 04, 2009 | Roland Music

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