SOLD. Brand new condition, save hundreds. The THD BiValve-30 30W Class A Amplifier Head is a pure Class A design with 2 output tubes wired in parallel and combined through a special output transformer to deliver up to 30W. It accepts almost any type of output or preamp tube without bias adjustment, even in combination, for an astonishingly wide range of tone available for nearly any style of guitar playing. The standard of construction is absolutely top class, as you would expect for any handmade amplifier. Underneath its large, perforated steel lid you'll find large transformers and hi-fi style internal baffle plates to cut down on hum. On its front panel is a pair of input jacks labeled More and Less, followed by a Cut switch (high-cut filter), Volume, Treble, Bass, and Attitude (driver tube response control). In the center is a light bulb that glows as the amp distorts with a small switch to turn it off, a control for the built-in Hot Plate (output attenuator), and a defeat switch for the Hot Plate. The amp sports an acid-etched control plate with a delicate marine theme inspired by Glasgow artist Charles Rennie Mackintosh. "The BiValve-30, running a 6550 and an EL34, produced a level of tonal complexity and sonic dimension that was simply off the scale. The BiValve-30 could easily be the richest, most detailed amp in its class." So says Guitar Player Magazine May 2002.

Year Condition
Call Brand New


Guitar Exchange
Bruce Sandler
Baltimore, MD
10:35 PM
circa 12 to 6 Monday thru Saturday, best to call.

We accept all major credit cards, as well as all of the other usual methods; cash, bank check, money order and wire transfer. All international purchases must be by bank wire transfer only. A 25% non-refundable deposit will hold an item for 30 days, other layaway terms considered. Layaway sales are final, no returns, 24 hour approval period is forfeited.

Customer is responsible for all shipping, handling and insurance charges, as well as any and all freight claims, but rest assured, we are THE BEST at packing. Worldwide service available via UPS, USPS, FEDEX, BAX GLOBAL, or other carrier of your choice, pending our approval. Customer is responsible for all sales tax where applicable, as well as any and all duties, brokerage fees, etc. on internatinal shipments.

All items shipped on 24 hour approval. If not completely satisfied, call within the allotted time for return authorization for full refund, minus shipping. Customer is responsible for any and all taxes,duties,brokerage fees, VAT,etc. and are non-refundable. Guitar must be returned in the same condition you received it in. If you need other terms or arrangements just give a call, we're reasonable people over here. No returns on amps, pedals or keyboards.