ABSOLUTE MAXIMUM RATINGS (Note 1). Maximum Temperatures. 2N/8/9. Storage Temperature. °C tOo+°C. Operating Junction Temperature. Part, 2n Category, Discrete. Description. Company, Central Semiconductor Corporation. Datasheet, Download 2n datasheet. Cross ref. Similar parts. Page 1. Adams Avenue, Hauppauge, NY USA. Tel: () • Fax: ()

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Where did you get the schematic? Since the 2N is in a TO case and rated for 50 watts with a 2N complement it makes some 2n3658 since they may have to provide more current to drive less than 8 ohms of the single speaker versions.

I assume it provides voltage amplification for the Class B drivers. You don’t need to ground the heatsink if you’re sure it cannot be shorted. Like the new look? The circuit also has less than unity gain.

You will definitely need a preamp to compensate that issue. The first transistor datashee the input, second the voltage amplifier.

2N_PDF Datasheet Download IC-ON-LINE

Like I said, getting rid of the mica insulator is nice it’s one considerable thermal resistance source less but definitely use the thermal compound: Here is the PA schematic section: Almost, but not quite. Both boards are secured to the control plate with the board mounted pots. I suppose someone did a hack job drawing this thing out. Without compound you leave microscopic air 22n3568 in between.


In fact, some copper mounting clamps that attach transistors to the heatsink may serve as a wondeful supply rail. I really hope it’s the latter. However, in my experience insulating the heatsink from the rest of the chassis and making sure it cannot be shorted by accident is a lot more difficult than just putting the mica or silipad washer between transistors and the sink. Yes, the transistors are original and still working fine and I won’t be replacing them.

Did you miss your activation email? I guess I’ll check around and see if I can find a different schematic.

This cap, as well as C21 are 35 volt caps. The front baffle is plywood.

2N3568 Datasheet

I’d say forget this circuit. It does get warm to the touch during operation. What totally confuses me is the lack of a DC path to establish the bias. I have much more confidence in this datashedt actually working. This is the trace area of the board underneath the heat sink.

There is no “chassis grounding” cap on the primary AC side, just the 1 amp fuse and switch. Q7 and Q8 had me confused until I realized the only way it could possibly work was push-pull Class A. How can the base of Q5 be more positive than it’s emitter when there is no source of datashdet positive voltage at its base? Not any real difference in tone, or distortion or anything like that.


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Getting rid of the mica washer which is both electric and thermal insulator is also beneficial. Three wires are separate grounds all coming off the main amplifier board. As such, I was able to ascertain what is what for those looking to service this amp, or try their hand at building the circuit properly.

Of the two circuit boards, the smaller one at the bottom is the Small Stone phaser effect. From Q7 through 2n35668, the circuit is identical. The wood strips used for mounting the back panel are stapled to the sides datashest the back. I guess I don’t understand why that would lead to instability.

I don’t understand that – during the early s Electro-Harmonix would sell you the amp in kit form, so I would think there would be at least some dated before Thanks for the confirmation that it won’t work as drawn!!