This is a complete kit for the DIYTube Dynaco ST35 tube amplifier. Includes everything you need to build a working amplifier. Includes a copy of the DIYTube instruction manual explaining assembly of the board and test voltage readings. Would make a Great iPod amp. Great project, easy to build and sounds great! Get yours today. Kits include our reproduction of the Dynaco Z565 output transformer as used on the Dynaco (tm) ST35 and SCA35 amplifiers, except that the output taps are 4 and 8 ohms, rather than the original 8 and 16 ohms, thus making this transformer useful where an original Z565 can't be used due to its lack of a 4 ohm output tap. The primary is wound the same as the original 565, same number of turns, sections and wire size, using the same patented Dynaco(tm) winding method, and made on the same core size and material. Only the secondaries have been adjusted to accomodate the different taps, and improved insulation material used (thus making the transformer more resistant to abuse).
These transformers have what you'd expect out of a Dynaco transformer, like healthy low frequency inductance (over 1000 henries at 60 Hz), high resistance to distortion caused by output tube imbalance, and low distortion overall.
Transformers and chassis are brand new production, MADE IN USA.
For the results of bench test comparison of our Z565-48 to the original Dynaco Z565, please click here
Note that in the examples given in the preceding, at high frequencies the noise/THD of the amplifier is greater than that of the transformer: the actual bench tested distortion figures at full power (17.5 watts) for the transformer itself are as follows: 1KHz 0.019%, 10 KHz 0.032% 15 KHz 0.029% 30 KHz 0.048% 40 KHz 0.058 %. This is practically within the measuring margin of error the same as of the original Dynaco unit.
Here's a similar comparison of the original Dynaco, Magnequest, Handwound, and two models of Hammond transformers (Acrobat plugin required to view).
Note in particular the comparison between the Dynaco part and the Hammond 1650F, comparably priced to our unit.
Transformer specs are:
8000 ohms CT primary with screen taps, 4 & 8 ohm secondary.
20 Hz to 20 KHz response at 17.5W, within 1 db (30-15 KHz @ 35W)
Max DC per side (suggested) 80 ma.
Height 3 inches (75 mm) width 2 1/2 inches (63 mm), depth over covers 3 1/4 inches (80 mm), mounting centers are 2 inches (52 mm) by 2 1/4 inches (55 mm).
Runs cooler, regulates better than original due to improved insulation technology that allows larger gauge secondary wire, resulting in about 25% less copper resistance on the secondary. Secondary is 330-0-330VAC at 180 ma DC rectified current, plus two 6.3V at 2.5 amp windings for filaments & pilot bulb. Primary is 120VAC 50/60 Hz. Measures 3 inches (78mm) high X 2 1/2 inches (64mm) wide by 3 7/8 inches (100mm) deep over end bells. Mounting hole bolt pattern us 2 inches (53mm) by 2 3/4 inches (70mm).
The chassis is the same size as a st 70 and has ample room for stashing upgrades underneath.
If you order this kit "with tubes", you will receive JJ EL84 Matched Quad, JJECC83/12AX7 x 1, and JJECC82/12AU7 x 1.
We now offer a custom fully built version. (Please allow approximately approx. 15-20 business days for build, depending on workload) See Dropdown menus.
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