#1
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So let's say I want to keep some transistors on hand
What's the deal with the part numbers of the transistors in the SM? Is each transistor given a separate number though the same transistor is used in multiple locations? I've been looking at replacements to keep on hand (since they're cheap and it's better to buy more to justify shipping costs) and there are roughly 6 part numbers that correspond to a single transistor (GE-27 is an example).
Also, do the replacement part numbers for other manufactures take into account whether it's a NPN or PNP? The reason I ask is that some of the NTE part numbers note it's it one of a pair of complementary transistors. For those, is there always a complimentary transistor somewhere in the circuit? Thanks
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
#2
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All the transistors with different part ##'s are different. When you sub them you are getting same or better specs. Works MOST the time.
Also case style & pin out must be watched. OEM transistors are selected closer to the needed specs to save $$ and best match the design. Most the time they make an " opposite sex" twin. They show up in audio & vert outputs on TV's sometimes. your TV uses none of the pairs as pairs. Some places you should only use OEM transistors. Horz output, IF & tuners, sometimes vert & audio out, power supply regulators. Very brand specific as to where you can get away with subs. Sometimes OEM's cost less. If you get a common failure you may stock the OEM instead of going to the subs. 73 Zeno |
#3
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I found a place that has about 60% of the ones I'm looking for of NOS Zenith parts. I think I'll grab those and start a hunt for more places. Thanks for the info.
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
#4
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Is there a brand of resistors recommended for replacements? I've run across a couple of them that aren't listed in the SM. They're noted in the pics and have an arrow pointed to them, but are not on the resistor list. I'm going to be doing some testing of them and figured I'd better get ready for replacements. I found many OEM Zenith ones online, but there are a number of them I can't find. So if I have to order from Mouser or such, which brand is recommended be those here?
An example of one I can't find is noted in Photofacts as R202 and noted on the schematics as just a 33K resistor and not on the parts list in the back of the SM. I found it on the underside and matched up the color bands, so I know it's a 33K 10% and is the only one. Being the only one I can't get the Zenith part number from another on the list. Thanks
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
#5
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find an old resistor kit or someones old resistor box. For new ones just use the newer flameproof ones. Smaller & more reliable. Only other caution on resistors is DO NOT replace carbons with wire wounds. You are putting a coil in the circuit & it can really throw off some circuits. 73 Zeno |
Audiokarma |
#6
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If I can find the values by the stripes, how do I figure out the wattage? I figure I'll play it safe and get 1w for all unknown. I figured that the wattage was like the voltage on caps. You can go up, but not down. I also ordered all 5% as I figured it would vary less than a 10% and this wouldn't affect the circuit.
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
#7
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I would stick with the original wattage, they act like fuses as well, better to burn up a resistor when something shorts than a hard to find component.
most resistors used are 1/2 watt, once you get used to them you can usually identify the wattage of a standard carbon resistor by how big they are. In most cases anything over two watts is going to be a wirewound. |
#8
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Really? I sure see a lot of them listed. In fact, I don't see any where they are not listed in the Photofacts currently sitting on my desk.
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#9
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#10
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It's Photofacts 1370-2n. If you look at page 16 you'll see parts identified via arrows on a picture of the underside of the chassis. On that page you'll find R202, R203 and R207 (all of which I've verified as being on my chassis). When you go to page 22 where the resistors are listed, it jumps from R201 to R206 and jumps again to R227. Quite a few have been skipped.
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
Audiokarma |
#11
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#12
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#13
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 Last edited by TinCanAlley; 08-15-2013 at 03:02 PM. |
#14
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Yes, 1/2 watt unless otherwise noted. The originals were 10% & 20% tolerance, but 5% tolerance resistors are now available without the large cost premium they had in years past.
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#15
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Thanks!
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
Audiokarma |
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