12 Technology Drive, Ste. 13   East Setauket, NY 11733

APT / HOLMAN REPAIR INFORMATION

There are really only two APT / Holman products we see for service,  The Holman preamp is by far the most common, although we have repaired many of the APT-1 amplifiers

HOLMAN PREAMP:
The problems  in this unit are always the same, intermittent audio, loss of signal, weak bass, etc. We have a standard service for this model: We resolder the PC boards, clean all switches and controls, upgrade the mute relay, replace all electrolytic caps with upgrade parts, replace the power regulators that are always overheated, upgrade the power rectifiers and check for any additional problems. If nothing unusual is found the repair/upgrade charge is 175.00
 We also offer a top level upgrade involving premium parts, Hexfred power supply, circuit mods to power supply and signal path and replacement of all audio IC's to Burr-Brown opamps. The cost of this upgrade is 375.00,  350.00  if there is no desire for using the phono section. There is no difference between the standard and "studio rackmount" units. If you have no use for he phono stage, the unit can be converted to 5-line input at no extra charge.

APT-1
Only two types of problem have been found-signal dropout and blown channel

The dropout problem is caused by bad solder connections. We resolder the board, clean and remount the output transistors  and replace a few caps for good measure. This usually corrects the problem. If this is all that is wrong, the repair charge is 125.00.

A blown channel in this set usually does no more damage than destroying the output transistors. If this is the case the repair would be 175.00 and includes the service outlined above.

An upgrade option involving upgrade caps is available for an additional 100.00