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Audio Engineering

Audio Engineering

Rolls VP29 Phono Preamp Enhancement and Hacking Project

Vinyl is still king. We don't have giant reel-to-reel tape decks at home, so the highest quality playback is still the good old long-playing record. The fact the industry is seeing double digit growth in vinyl sales just cements that fact. People that love music, love vinyl.

The Rolls VP29 Phono Preamp costs less than $50 (still!) and sounds pretty good and is a common and great intro into listening to vinyl; really good for the price. It's currently got 4.3 of 5 stars on Amazon. And there are lots of reviews. That usually means a product is pretty good. I have to agree.

Still, you can enhance this device pretty cheap if you're willing to hack and play around. Here is what I did many years ago when I picked up my copy.

First, let's take a look at what one looks like. It's made in the USA and is compact chasis with in and out and even a headphone amp.

Rolls VP29 Phono Preamp Enhancement

Rolls VP29 Phono Preamp Enhancement

So looking inside, you can see some of my changes, removing the headphone jack and adding a couple giant film cans. Note the larger electrolytics too. BTW, I wrapped the large film caps in grounded foil to reduce their imprint on the circuit. Less noise. Less crossover.

Rolls VP29 Phono Preamp Enhancement

And a voltage regulator mounted to the chassis for heat removal.

Rolls VP29 Phono Preamp Enhancement

The factory schematic:

Rolls VP29 Phono Preamp Enhancement

So what did I do? Essentially, embrace what the VP29 was and upgrade its core with higher quality parts. Here's the quick rundown:

And my revised schematic:

Rolls VP29 Phono Preamp Enhancement

This little preamp sounds really nice; really, really nice given the price. You can get better pretty easy, but the $ figure jumps pretty quick. I think you'll spend 4-5x minimum on a production preamp that can hang with these simple modifications.

Modified or not, the VP29 can best most onboard phono pres; especially on old gear with really bad electrolytics... which if you upgrade to a more expensive unit, will immediately dispense of electrolytics with film. Again, unfortunately, this VP29 doesn't have room for that complete mod, but this will max out what $100 can do for your vinyl collection.

Either drop $250-$1,000 or try this little trick out for less than $100. Please let me know what you think. Interested to see your results. Thanks for reading.

Happy hacking. ~Sean