TL064 in PV 212 Deuce, VT Series, 1980

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REA

See the link below that has both a crossreference PDF for Peavey parts, but also a PDF for the replacement of the TL604 part with a small PC board.

Dan

Link:

See the link below that has both a crossreference PDF for Peavey parts, but also a PDF for the replacement of the TL604 part with a small PC board.

Dan

Link:

Thanks for that , I was looking for refs to TL604 and 4066

I have a Peavey Mace VT model of about the same age. If you want/need a schematic, it may be best to get one directly from Peavey customer service, as the one I was able to find online wasn't accurate in several areas, even though it was an actual Peavey engineering schematic.

peavey mace deuce vt [2 MB]

I'm not certain that a schematic from Peavey would be more accurate, but it could be.

In the downloaded schematic mentioned above, pin numbers of the footswitch receptacle/jack (the jack has no connections at pin 3) and corresponding circuit locations of those connections were different.. also there were a couple of small capacitors present on the main board that weren't shown.

FWIW, a "fix" (contrary to an actual repair) solution I found regarding the reverb section, was to jumper the TL604 location so the reverb section was always on.. then just turn it down when not wanted.

-- Cheers, WB .............

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The schema + overlays I downloaded in 2007 , source URL would be a workup to back track to , are 8 jpg files named Peavey_Deuce1a.jpg

...1b, .... 2 ... 3.... 4b So far in full agreement with the Deuce of 1980 I have here. I say 1980 but no confidence on that as IC datecode (probably as socketed) any more certain dating of these

I'll give the plug-in SG211 mod with ribbon a go rather than circuit mod

Those jpgs may have been wrapped up as pv_deuce.zip

See the link below that has both a crossreference PDF for Peavey parts, but also a PDF for the replacement of the TL604 part with a small PC board.

Dan

Link:

That adaptor would work as used in this amp , as single pole change over but not generally for the 604 with 2 separate SPST alternately active as no inverter in that package. One of the other unused 2 in the DG211 and a resistor could perhaps be made to invert one of the control lines.

See the link below that has both a crossreference PDF for Peavey parts, but also a PDF for the replacement of the TL604 part with a small PC board.

Dan

Link:

Back working again. A neat 1 x 3/4 inch matrix board mounted vertically, enough space, with lowest .2 inches tied and glued around an 8 pin turned pin socket to fit into the existing socket. Bridging wires dsoldered into the turned pins. Sockets glued together as now a rockable assembly.

This is the node map TL604 , DG211 pin1 , pin5 p2 , p8 + p16 p3 , p2 p4 , p7 p5 , p4 p6 , p6 p7 , p3 p8 , via 10K to p13

DG211 additional comps p1 via 4K7 to p5 p5 low side of 5V zener high side to p12 p12 via SM 10K to p13

I've left the 2 unused 211 controls unterminated, as in pv cct, just in case circuit critical but probably should be tied to DC

Good on you for doing a decent job. The "fix" solution I mentioned was intended as a troubleshooting tip, as I stated "contrary to an actual repair".

What surprises me is that there aren't dozens (or more) substitute ICs that would work for this application of switching (even if not a pin-for-pin exact replacement), since nearly every electronic product has eliminated the use of real switches with keypads or other momentary button actuations which latch/unlatch various features or functions (without using relays).

I won't be looking up switching ICs in databooks (as I might've done when I was younger).. I'll rely on Peavey's solution, too.

-- Cheers, WB .............

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With a SMD 211 I suppose it would be possible to make a direct plug-in pin for pin space for space version. Then those unobtanium f dividers for old synths etc

Today, hopefully replacing a cleaned out rotary "encoder" for a Yamaha amp today and be able to reliably up/down select inputs again. But got me thinking if you had to make one of these as a replacement, it would be quite possible. Indented 10 or 12 position rotary but offs in the detent posistions and off-radius pairs of contacts so outer contacts make momentarilly before the inner pad between each dedent, clockwise and opposite for acw

I had this other substitute in my Peavey amp folder, but I forget where I found it (originally was TL604 DG419 cross reference.doc).

I haven't tried this substitute, so it should be examined closely comparing datasheets for each device to substitute a TL604 with a DG419 with the pin changes and components added. It may be worth considering adding the zener mentioned in the DG211 plans.. although it may not be required.

I dunno if either IC is more readily available (DG211 or 419), although the DG419 is an 8-pin device.

Pin 5 of the DG419 must see +5VDC for the chip to work properly. This can be done with a voltage divider network connected to the +15VDC supply:

1. Connect a 2.2k resistor from the +15 VDC supply or pin 4 of the DG419
2. Connect a 1k resistor in series with this 2.2k resistor to ground.
3. Connect the 2.2k/1k node to pin 5 of the DG419.

TL604 pin DG419 pin

-- Cheers, WB .............

I have a few dozen 211 radily at hand and PV proven workaround and plenty of headroom available