Re: [Harp-L] Input Impedence

["Jim Greenwald" <staggerin@xxxxxxxxx>]

Hi
In general, an input stage on an amp made for guitar or bass "sees" around 250-500 KOhms from the instrument and is designed to present that range and higher for max signal transfer. As an exception, some specialty amps are made for guitars with active electronics and have lower input impedances. The Ampeg ain't one of them - should be fine.

Cheers,
Staggerin' Jim
Listen to Roots Harmonica at http://www.live365.com/stations/staggerinjim
  ----- Original Message ----- 
  From: Walter Joyce 
  To: Harp List 
  Sent: Thursday, February 14, 2008 3:55 PM
  Subject: [Harp-L] Input Impedence



  I have  a 1990s Ampeg Reverbrocket r212r and I have a question for the gear heads on the list.

  How can I find out the input impedance for this amp? I have checked the owners manual, the schematic (I may have missed it there as I am new to schematics) and did an online search and couldn't find the input impedance rating.

  I am asking because spec sheet for  a new mic I bought says it works with and input impedance over 250,000 ohms and I want to know if the Ampeg is a good fit. 
   

  Thank you,

  Walter




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