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This listing has ended. Item:TriodeElectronics ST-70 ST70 Driver Board Upgrade EF86  |
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Triode Electronics
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Our newest version of the EF86 board has been slightly revised to accept 6922, 6DJ8, 7308, and 6CG7 in the phase inverter position as well as 12AU7, 12BH7, and ECC99 that were previously supported. All kits include instruction manual, but not tubes, each board requires 2 EF86 or equivalent tubes and one of either 12AU7/ECC82 (or equivalent),12BH7 or ECC99. This board is made with heavier (2oz) copper and plated through holes. Standard coupling capacitors are Xicon metalized polypropylene. You can also upgrade and get Solen Metallized Polypropylene Capacitors from our website. www.triodeelectronics.com Also, we have devised a simple project to convert the Triode ST-70 driver board into a microphone pre-amplifier! Check out our website for sample schematics!!! For ST-70 Capacitor upgrade boards and transformers, Please check out our other auctions  Triode Electronics as we are listing lots of vintage tubes and electronic items. Good Luck
Export shipping (outside the USA) available only to countries where postal insurance can be obtained for your package. Approximate shipping weight: 2 lbs from zip 60634. Please see shipping calculator below for shipping cost. Illinois Residents must pay sales tax. Buyer must respond within 3 days of auction ending. Transactions not completed in 14 days will be resold. Shipping for customers in the USA is available through UPS or USPS, UPS ground is the standard method. Overseas customers can choose between UPS and USPS International Priority Mail. We will only ship via insured methods of delivery, this means no USPS International First Class Mail. Buyer is responsible the cost of insuring the package. We will do our best to describe the items correctly but due to the wide range of items we list it is possible we may not always get it right so please ask any questions before you bid. Once you bid you agree to all terms of the auction. Vintage gear is sold as-is unless otherwise specified, this means no returns or refunds on vintage items! All new production tubes come with a 1 month warranty and against manufacturing defects and new production transformers have a 6 month warranty against manufacturing defects. You must return the defective tubes or transformers to us for inspection before you will recieve a replacement or refund, buyer is responsible for any shipping costs associated with the returning the item to us. Please check our other auctions for more tubes, electronics 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 773-327-5652
On Jun-10-08 at 18:33:01 PDT, seller added the following information:
Our Board's are a great choice if you really want to learn more about how your amplifier operates, too. You see, unlike many other Kit's, you are not totally locked in to only certain components, nor are you stuck with unchangeable circuit values which limit the versatility of your amplifier and further modifications. There's no "big secrets",you don't need permission from a "guru" to change or tweak it, the manual has instructions for about every change you could imagine making. Instructions are included for triode connecting the output tubes, which will give you a taste of hi-end triode-itis for the cost of 4 resistors, about $1. So, you've got a choice..you can just plug in & play, or you can do your own experimenting if you'd like to, learn a lot and become your own neighborhood Dynaco guru. And you won't break the bank doing it, either. The stock board parts kit includes metal film resistors, polypropylene & polystyrene capacitors, which do just fine..but if you like you can modify many component values and try different or exotic parts and tweak to your heart's content. The boards will adapt to output tubes which need very low drive circuit impedance/ DC grid resistance like 8417's- or may be modified to whip out enough voltage to drive 6B4's!! (even 300B's might work.). The board sounds fine, even with the off the shelf, current production tubes, and special grading and matching is not absolutely necessary. It is a good example of what can be done with the original type of circuit with improved components, and makes a good case for the virtues of simplicity and short signal path in audio design. Our PC boards emulate the simple but highly effective (due to the short signal path and single gain stage) original Dynaco circuit, but with lower hum, noise, distortion and a wider voltage swing across heavier loads than a 7199,6GH8,6BL8/ECF80, 6U8/ECF82 or 6AN8 are capable of.
On Sep-08-08 at 08:34:36 PDT, seller added the following information:
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