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monoblock input resistor value

Posted on January 13, 2021 at 23:23:13
glue tech

Posts: 122
Location: western new york usa
Joined: March 27, 2014
hi all,
I'm rewiring and simplifying my quad 50e mono blocks. These have an input pot. Their cousins the 50d do not. I would like to eliminate it. the schematic shows that the pot is 40k to 10 k. the 50d schematic shows a 10k resistor. a search shows many types and wattage ratings of 10 k resistors. What type and wattage rating of resistor should i pick for this application?


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RE: monoblock input resistor value, posted on January 14, 2021 at 13:18:43

Posts: 2341
Location: SF Bay Area
Joined: June 20, 2020
Input resistors don't see much current so a 1/4 watt should be fine (unless I'm missing something). I would consider a very high quality resistor like a Vishay metal foil (S102) or at least a Dale RN55. Surplus Sales of Nebraska has quite a few S102 and S102c resistors at very reasonable prices.

Get your facts first, then you can distort them as you please- Mark Twain


RE: monoblock input resistor value, posted on January 15, 2021 at 05:27:45
B. Scarpia

Posts: 2864
Location: Near Pisgah Forest
Joined: October 30, 2019
May 23, 2020
I use Audio Note 1/2 Watt Tantulum as input resistors on my 'Blocks which are "reasonably" priced from Parts Connexion.

There's no virtue in being old,
it just takes a long time


RE: monoblock input resistor value, posted on January 16, 2021 at 12:34:20

Posts: 10568
Location: Bethesda, Maryland
Joined: December 11, 2000
Just based on the model designations you provided, it seems that the use of the potentiometer at the input came later than the use of the single value resistance (50E vs 50D). Have you used the 50E amplifier in your home system, and when you did, what setting on the pot sounded best? I ask because for some preamplifiers, especially for a tube based preamplifier, a fixed input impedance of 10K ohms might be problematic. On the other hand, getting rid of the pot per se may improve SQ.


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