Stewart Model UDP-1a Universal Dynamic Preamplifier

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No sales tax for customers outside California.  

Stewart Model UDP-1a Universal Dynamic Preamplifier.

No Power Cable, runs on 9v Battery.  Tested in our shop prior to listing.

Fantastic tone shaping preamp.  

Lots of players use this pre with upright as well as electric bass.  Also used for acoustic/electric guitar, sounding great doing so.  

Shipping policy:

Shipments will require signature on delivery, no exceptions.  If there is damage, the buyer must retain all packing materials intact and picture them immediately and send them to  Less than 1% of our shipments are damaged in transit, and we are committed to making sure your item arrives safely, but we are taking these additional measures to make sure you are happy with your purchase.   



We Pack with Care

We pack items extremely well & utilize special vintage instrument insurance in case there is a damage claim.

Shipping Services

We prefer UPS based on their performance before & during the pandemic. USPS is usually our choice for international shipping.

Out the Door Quickly!

We turn your orders around quickly so you aren't fiending for your items for long. Most orders depart within 24 to 48 hours.