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An audio pre-amplifier, really bad

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iMo:
I can myself hardly imagine I would buy an "electronics something costing more than $10" from a smaller manufacturer without seeing details of the internals, regardless how nice it would look like from outside..

themadhippy:

--- Quote ---The next question is why you need a preamp at all.
--- End quote ---
source selection and as you say volume control

Analog Kid:

--- Quote from: themadhippy on January 14, 2025, 02:31:54 pm ---
--- Quote ---The next question is why you need a preamp at all.
--- End quote ---
source selection and as you say volume control

--- End quote ---

2-pole multi-throw rotary switch, ganged potentiometer and you're done.

joeqsmith:

--- Quote from: bdunham7 on January 14, 2025, 04:02:02 am ---
--- Quote from: Analog Kid on January 14, 2025, 01:23:31 am ---And why in the world does a preamplifier need huge output transformers?
Every tube audio amplifier circuit I've ever seen requires no transformers between stages until one comes to the push-pull (or class A single-ended) output stage.

--- End quote ---

The next question is why you need a preamp at all.  The trend nowadays seems to be very expensive "preamps" that don't even have a phono stage so they're line in to line out.  I suppose you need a volume control...

--- End quote ---

I built a pre-amp for my sister exactly for the reason you mention, lack of a phono input on modern amps.   A few years back I repaired my dad's old record player and ran into the same problem.   Since I have rebuilt his old amplifier and tuner.   

https://www.eevblog.com/forum/projects/my-dads-vintage-hi-fi-fisher-amplifier-kx-100/

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