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Help needed for Magnavox 8301-10

Scotteboy

Scotteboy

Active Member
Hi all, been a while since I last posted, retirement has kept me busy ! I have restored and fixed quite a few amps including the likes of fisher 500c etc.

I have a simple amp a Magnavox 8301-10 (I have fully recapped it , and installed new tubes) that has the volume, bass and treble controls attached but unfortunately the schematic I have does not show this part of the amp.

Without tubes all the voltages and resistances check out but with tubes in the 6eu7 has normal voltage on pin 6 but pin 7 voltage is low and goes up and down if I turn the bass control. This amp has one of those clay like packages that has 5 terminals connected across the bass control and it has been described here as a tone defeat.

I have made up one of these type of circuits when they appear in the schematic but it is not shown on mine. I am asking how to repair or remove this section or what could be causing this voltage drop if this is not the problem. I also can't get a signal through one channel. All help appreciated !!
 
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Scotteboy said:
.. I have a simple amp a Magnavox 8301-10 (I have fully recapped it , and installed new tubes) that has the volume, bass and treble controls attached but unfortunately the schematic I have does not show this part of the amp.
Click to expand...
Hopefully the schematics in post #19 in the link below can help

Tuquala

Thread 'Magnavox 8301 Mods'

I recently picked up a Magnavox 8301-10 amplifier, and plan on modifying per a thread started by cubby01 about the same amp. I plan on driving it with a Yamaha RX-V3000 from the pre-outs and hooked up to Forte 1's.

Some questions I have are pertaining to ideas and comments from cubby01's thread:

I plan on removing the tone control and loudness, and putting in a volume control according to diag 3. Any negatives to having a vol control vs none??

Adding a 470k resistor (or ??) from grid to ground on the 6EU7. Will this be right for a solid state preamp such as in the Yamaha?? or...
 
Hi Dswankey ! Thanks for the threads ! I will try cutting out the pec and or build one to see what happens . Schematic will be most helpful !
 
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