Your bidding on a used TFM-22 for sale for parts only or repair.  Amplifier gave me many years of trouble free service.  However, recently it has not worked properly.   The amp drove subwoofers in my home and now the amp does not provide as deep or as tight bass as it once did.  Also, amp headroom seems to be exhausted rather quickly.  My uncle is an audio technician and he repaired the amp once but the repair did not hold.  Assume this amp does not work and only buy for parts or repair if you have the experience necessary to repair.  Included in Carvers TFM-22 Service Manual and Schematic Diagram.  The manual and schematic alone is worth $20.