Transformer Bundle w/ Free Choke for Dynaco ST70 st 70

Want to to home-brew your own Dynaco ST70 clone, or have a bare chassis to fill? Buy the PA060S power transformer and two of the the A470S output transformers, and we'll toss in the C354 choke ($13.95 value) for free! Brand New Production. Made right here in in Chicago,USA,  By a factory thats been making them since the 1950's. We are factory direct dealers and pass the savings on to you. Wholesale prices, at single piece quantities...

Check out our st70 chassis, and upgrade boards to complete your project.

PA060 Power Transformer:

Improved replacement power transformer for Dynaco ST70. Heavier construction, runs cooler, gives better regulation, won't buzz & hum like some originals do. Bolts in to ST70. No modifications required, wires have identical color coding as the original unit. Extra long telfon insulated (instead of cheaper PVC) leads.

Secondary B+ winding is 720VCT (360-0-360) at 300 ma with 55V bias tap, plus two 6.3VCT 5 amps & one 5V 4 amp tube filament & rectifier windings, and 55V bias tap.. Can use solid state rectifiers or any single tube rectifier with filament up to 5V at 4 amps (or 2 5AR4/GZ34 could be used in parallel) & sufficient B+ current rating....usually, 5AR4 or 5U4. (note, watch that the voltage isn't above capacitor ratings if solid-state rectifier is used!) Primary 120VAC 50/60 Hz. Mounts in 2 5/8 by 3 1/2 inch (67 X 90 mm) hole, mounting bolt pattern is 3 X 3 3/4 inches (77 X 96 mm). Nice long teflon insulated leads.

Using the PA-060-S to replace power transformers in other amplifiers... yes, it's possible, in amplifiers that need about 420-440V of B+ at from 150 to 250 ma, and the dimensions are similar to some other vintage amps (certain Scotts, at least). The problem in some Scott ,Fisher and other amplifiers is that you'd have to take the preamp filament supply off the 6.3V windings, wheras in most originals this came off the bias winding...the PA-060-S only has a bias *tap*, which will do fine supplying bias voltage, but won't support filament current. Overseas customers check out our export version. Transformer Bundle w/ Free Choke for Dynaco ST70 240V

A470 Output Transformers:

The primary is wound the same as the original A470, same number of turns, sections and wire size, using the same patented Dynaco winding method, and made on the same core size and material. Only improved insulation material used (thus making the transformer more resistant to abuse) and nice long (10 inch/ 25 cm minimum) teflon insulated leads have been added.

This transformer has what you'd expect out of a Dynaco transformer, like healthy low frequency inductance, high resistance to distortion caused by output tube imbalance, and low distortion overall. They're great for both hifi and guitar amplifier DIY projects (such as the Eiclone project at www.diytube.com ) as well as replacements for Dynacos.

This type of transformer can be used with many tube types, such as 6550, KT88, KT90, 6CA7/EL34, 300B, 2A3, 6B4 or push-pull parallel 6BQ5/EL84 & 6V6-GT. It may be used with triode, pentode, or ultralinear (screen tap connection) wired tube arrangements.

Transformer specs are: 4300 ohms CT primary with screen taps, 4,8 and 16 ohm secondary. 20 Hz to 20 KHz response at 35W, within 1 db, 30 to 15 KHz at 70 watts. Max DC per side (suggested) 80 ma. Exact same dimensions as the original A470 Dynaco transformer: Height 3 1/2 inches (88 mm) Width 3 inches (75 mm), depth over covers 4 inches (101 mm), mounting centers are 2 5/16 inches (59 mm) by 2 7/8 inches (72.5 mm). Shipping weight 7 pounds.

C354 Choke:

Replacement for chokes in Dynaco ST70, Mk2, Mk3 and Mk4. 1 1/2 inches (40 mm) tall on 2 3/8 inch (60 mm) mounting hole centers. 55 ohms, 1.5 henries, 10% tolerance, 2500 volt DC hipot tested, 200 ma DC. New unit made in Chicago,USA by transformer professionals with decades of experience manufacturing high voltage transformers.

Brand new production, made right here in Chicago, USA.

Transformer carries manufacturer's 6 month exchange warranty on materials & workmanship

Approximate shipping weight: 23 lbs from zip 60634. Illinois Residents must pay sales tax. Buyer must respond within 5 days of auction ending. Transactions not completed in 30 days will be resold. Ask any questions before you bid, once you bid you agree to all terms of the auction. Please check our other auctions for more electronic and ham radio goodies. For Tubes and Parts - Check Us Out! Triode Electronics 5633 W. Irving Park Rd. Chicago, IL 60634 Thanks for Looking... Ph 773-871-7459 fax 773-871-7938

Export sales outside the USA only to countries where postal insurance is available. (yes, that includes Canada) We will only ship these outside the USA by air shipping, if you are outside the USA please see shipping calculator below or contact us for a shipping quote before bidding.

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