Speaker Asylum

Marantz HD-88 Crossover Schematics / Pots

99.54.92.250

Apogee Bob C

Have looked online but not been able to find schematics for the Marantz HD-88 speaker crossovers. If anyone has these, they would be most appreciated. Also, does anyone know the values of the variable resistors used to adjust levels of the tweeters and midrange? I've cleaned mine of corrosion but they were badly damaged and remain too fiddly -- they have to go.

Thanks!
Bob Carr

Follow Ups:

RE: Marantz HD-88 Crossover Schematics / Pots - Coner 19:38:42 09/17/16 (2)
If the controls are L-pads (not a standard pot), those are easily
obtained from Parts Express. The back of control should be printed
with the ohms value. They come in 4, 8, and 16 ohms. L-pads use
a ground wire to one of the terminals, a regular pot will not.

Edits: 09/17/16
- RE: Marantz HD-88 Crossover Schematics / Pots - Apogee Bob C 16:53:35 09/18/16 (1)
  Thank you, Coner. There are just two connectors on the "pots." The pots appear to read 3 Ohm, 5 Ohm and 10 Ohm. I read the L, M, N as just being sequential indicators of some sort.
  
  I don't see anything similar on Parts Express so perhaps I'm reading these wrong or there's a missing zero or something. I've attached a couple pictures. Your thoughts are much appreciated!
  Bob Carr
  - RE: Marantz HD-88 Crossover Schematics / Pots - Coner 07:56:11 09/19/16 (0)
    Great pic and info, thanks!. Looks like regular pots there, the
    old AR speakers did the same thing.
    
    I might be tempted to still use L-pads, but use them as pots, just use
    one side of it? (no ground). Use 4 ohm pads for the 3 and 5 ohm, and
    use an 8 ohm to replace the 10. All 15 watt pads.

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