Is the pre-amp for the SM91 still available as a replacement part?
If so, whats the #, cost and would we as a dealer order thru service?
The original preamp assembly supplied with the SM91/SM98 was a small die-cast rectangular box with a 3-pin male mini connector on the microphone input side and a 3-pin male XLR connector on the audio output side. The box had a compartment for two 9-volt batteries, an on-off switch, and a low-cut switch. It could also operate on phantom power.
The original preamp was replaced by the ILP-1 preamp assembly, which was a cylindrical module, again with a 3-pin male mini connector on the input end and a 3-pin male XLR connector on the output end. This preamp had no battery capability and could only operate with phantom power. It had a low-cut switch and a +10dB gain switch.
The ILP-1 was also discontinued several years ago, and is no longer available from Shure Service. However, the preamp used with the present Beta 91and Beta 98 will work with the original SM91/SM98 using the "appropriate" connecting cable. This current preamp is the model RPM626. It is a phantom-power-only device and has no control switches.
The SM91/SM98 has a 3-pin male mini output connector and the Beta98/Beta91 preamp has a 4-pin male mini input connector. Thus the appropriate cable must have a 3-pin female mini connector on the microphone end and a 4-pin female mini connector on the preamp end. The C98D is a 15 foot long version of such a cable.
U.S. retail price of the C98D is $22.97 as of February 2004. U.S. retail price of the RPM626 is $79.91 as of February 2004.
Order the RPM626 and/or the C98D directly from Shure Service or from any Shure Dealer.