Author Topic: 16 8 and 4 ohm taps resistor question  (Read 2869 times)

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Offline MusicFox

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16 8 and 4 ohm taps resistor question
« on: June 09, 2009, 06:58:59 pm »
On the schematic for my 69 Solarus it shows a 1K ohm resistor of some type coming off the 16 ohm wire between the output transformer and the main and switching speaker output jacks. It connects to FB on the schematic near a 390 pf cap. As it is it's wired a 16 ohm output with 8 ohm jack (for 2 x 16 ohm cabs obviously) I wish to change amp to a 8 and 4 ohm configuration. Do I make sure this resistor is on the 8 ohm tap when I change it over? Why is it there anyway?  :? Feedback line? OK I studied it, it must be feed back line if so..... it looks like it would be open if second cabinet plugged in. I see feed back connected with one cab disconnected with 2 cabs......Do I need my eyes examined?

 This site is great and the people helping people super coool. Thanks.

PS I wonder why someone doesn't market a device to knock down AC to 110v levels for older amps. A user friendly consumer oriented device not a Variac obviously. A no brainer device. Am I slow on the uptake here.....does it already exist?
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Offline loudthud

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Re: 16 8 and 4 ohm taps resistor question
« Reply #1 on: June 10, 2009, 09:12:50 am »
You should leave the feedback connected to the 16 ohm tap. On amps that only use the 8 and 4 ohm taps connected to the jacks, the feedback still goes to the 16 ohm tap which just goes to one of the terminal strips.

Offline djc

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Re: 16 8 and 4 ohm taps resistor question
« Reply #2 on: June 14, 2009, 12:58:57 pm »
a power conditioner maybe your anser.  I don't know if it can be dialed back to 110 though.  probably cound.  basically regulates the voltage and suppresses noise.  no power spikes etc.  they are a good investment for any equipment.  here's an example of one

http://www.furmansound.com/product.php?div=01&id=M-8Lx