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Related Manuals for diytube stereo 35
Summary of Contents for diytube stereo 35
- Page 1 35 power amplifier rev c INSTRUCTIONS FOR ASSEMBLY OPERATION Price $10.00...
- Page 2 Lethal voltages exist in the capacitors even after unit is powered down, so wait at least one hour to after unplugging to allow charge to dissipate. Warranty Information Warranty Information Warranty Information Warranty Information All goods purchased from diytube have a thirty (30) day warranty from the date of purchase against defects.
- Page 3 Overview of the Schematic and Design Overview of the Schematic and Design The design closely resembles the Dynaco Stereo 35. The use of one 12DW7 per channel has been replaced by ½ a 12AX7A and ½ a 12AU7. The 12AX7A is a voltage amplifier that directly drives the 12AU7, a cathodyne phase splitter.
- Page 4 TIP: PCB Stuffing TIP: PCB Stuffing TIP: PCB Stuffing TIP: PCB Stuffing Use the flat end of the 10-pole terminal block as a lead bending tool. This works for most of the parts. Do take care to not damage the meniscus of the components.
- Page 5 b. solder splashes and shorts between socket pins c. any connections that solder didn’t flow to the other side (like ground plane connections) d. snip excess leads e. compare your board to photos from the website – a good check for capacitor orientation Initial Impedances: When it Doubt Initial Impedances: When it Doubt Initial Impedances: When it Doubt...
- Page 6 Initial Settings: Feedback and Bias Initial Settings: Feedback and Bias Initial Settings: Feedback and Bias Initial Settings: Feedback and Bias WARNING: Do these adjustments with the unit off and unplugged, as well as having had one hour to bleed voltage from the filter caps. 1.
- Page 7 Modifications Modifications Modifications Modifications • If volume controls are desired, use a 100k or better audio taper pot. A linear pot will not work correctly. You can salvage the 250k pot off of your Dynaco SCA-35. Radio Shack has a 100k Alps stereo pot that many people use.
- Page 8 Stereo 35 Rev C Revised: Sept 3, 2010 Tip: Put a dot in the checkbox if you have the part already as a quick reference when ordering parts. ‘X’ out the checkbox when you have installed the part on the PCB.
- Page 9 Stereo 35 Rev C Revised: Sept 3, 2010 Item Reference Part Mouser Part Unit Cost _________________________________________________________________________ Note: Change the last letter of the part number, ‘G’, to a ‘Y’ or ‘R’ for a yellow or red neon indicator on the power switch. Default is green.
- Page 10 Stereo 35 Rev C Revised: Sept 3, 2010 Item Reference Part Mouser Part Unit Cost _________________________________________________________________________ Note: I’m assuming this is the area people will improvise most, and with parts they have on hand. I highly recommend parting out a Dynaco SCA-35 as these are the same transformers found the in the highly regarded Dynaco ST-35.
- Page 11 V3 EL84 J2 Output Transformer Hookup i/c'' i/c''' 0.1uF J7 Left Channel Input 470K PF left 0.1uF 470uF 6.3VAC A 6.3VAC B 150K 470K 33pF 0.22uF 470uF R3 470K 0.1uF R5 1.27K i/c''' NF left i/c'' 15pF V4 EL84 PF left R12 33K 320V NF left...
- Page 12 320V D1 UF4007 100, 3W D2 UF4007 3.3K, 1W 3.3K, 1W 100, 3W CON10 120uF 120uF 120uF 120uF 300K Keystone CL-90 .1, 3W ww 6.3VAC A 6.3VAC B .1, 3W ww...
- Page 13 Z-565 8 OHM green/white Left Output Transformer blue/white black blue yellow 16 OHM green orange Z-565 8 OHM green/white Right Output Transformer blue/white black Right Channel Logical Layout of the diytube Stereo 35 Left Channel with Dynaco Transformers...
- Page 14 8 OHM brn/yel grn/yel Just think green/yellow to green, and black/yellow to black. blk/yel 4 OHM blu/yel green blue black Hammond Style Right Output Transformer Right Channel Logical Layout of the diytube Stereo 35 Left Channel with Hammond Transformers...
- Page 16 9.250 1.000 1.260 3.480 0.300 4.625...
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