Not comparing them well just shipping costs between me and my tight budget I just want to know who offers cheaper shipping? I haven't done any business with either store nor do I want buy transistors from eBay due to them possibly selling fakes. The transistors I need are 2N6487 and 2N6490 (for a very early punch 150 1 channel is shorted) and I need two of each and I checked the quote from Mouser and their cheapest is $7.72 so my total would be 17.52 approx? So I'd like to know if they have anything cheaper because these aren't big items. Or does someone have any 2N's for sale?? Thanks and let me know what's best.
As for the Punch 150 I let one channel touch and it blew the speaker fuses and it turned (the whole amp) and I thought it was the end for that amp but I put a new in line fuse in and it turned on again but played music from the left channel the other just voltage coming out so I figure I just shorted some transistors the rest of the amp appears the be fine.
As for the Punch 150 I let one channel touch and it blew the speaker fuses and it turned (the whole amp) and I thought it was the end for that amp but I put a new in line fuse in and it turned on again but played music from the left channel the other just voltage coming out so I figure I just shorted some transistors the rest of the amp appears the be fine.
I generally use mouser for small orders. At one time, Digi-Key had a minimum order of $25. Anything below that had a handling fee. I don't think they have a minimum order requirement any longer but you should ask before ordering.
I'd suggest that you order the 6488 and 6491 and order extras. The 88/91 have more applications due to the higher voltage rating.
I'd suggest buying on-semi or ST, not Central Semi.
I'd suggest that you order the 6488 and 6491 and order extras. The 88/91 have more applications due to the higher voltage rating.
I'd suggest buying on-semi or ST, not Central Semi.
Here is a good site to check the stock and compare prices:
FindChips.com Online Electronic Component Distributor Inventory Search
Newark seems to have the best stock and prices for both parts...
FindChips.com Online Electronic Component Distributor Inventory Search
Newark seems to have the best stock and prices for both parts...
Their prices are good both digi key and mouser just the s/h I'd like to know about. I guess I'll just order from mouser and four of each.
Would it wise to replace the other side or just leave it.
But would it make a difference on the performance? Also will it put out more power with the newer transistor? And how about the power supply transistor? They are BUZ10 50v 23 amp what if I replace them with a tab bit higher rating ? Or should I leave those? Not really trying to mod the amp but improve durability.
The amp won't perform any better but would be more reliable with new outputs.
With any old amp, you have to expect more random failures than with a new amp. If it's going to sit on a shelf, replace only what needs to be replaced. If you're going to drive it hard daily, you may want to replace a few more parts than what's absolutely necessary to get it working.
With any old amp, you have to expect more random failures than with a new amp. If it's going to sit on a shelf, replace only what needs to be replaced. If you're going to drive it hard daily, you may want to replace a few more parts than what's absolutely necessary to get it working.
Unless your International and then the minimum they'll use is a "Priority Mail International" and because they use there own box it costs about $35. I know because I ordered about 12 SMD resistors which would have had no issues in a envelope. So as a result on a $2 order I got charged $35 and my resistors showed up in a box about 1.5ft x 1ft x 3in. The issue was because it was international or something they can't give you a shipping quote and they just charge you once they send the item. So I sent of a complaint email and there response was it's standard procedure that all International orders get sent like that and "tuff if you don't like it".
On the other hand, Mouser started frequently upgrading my shipping to UPS next day about the fourth order - I had only spent under $500 over a year. Mouser is my favorite, based on its parts search feature. Digikey has improved their parameter based search since then, though.
To ease the pain, if you plan to keep repairing/building, stock up on some frequently used parts - common resistor values 1K, 10K, 220, 100 nf caps, 220 uf electros, 1n4007, 9.1V zeners, your favorite TO220 bipolars, some IRF610s, etc. Shipping isn't likely to change much if you buy 30-40 worth of small components.
To ease the pain, if you plan to keep repairing/building, stock up on some frequently used parts - common resistor values 1K, 10K, 220, 100 nf caps, 220 uf electros, 1n4007, 9.1V zeners, your favorite TO220 bipolars, some IRF610s, etc. Shipping isn't likely to change much if you buy 30-40 worth of small components.
No, I'm not international i'm in the USA but I still kind of think $7.72 is still to high (I'm in college and I really have no job so I'm trying to save $) but I still have no problem forking up alittle more shipping money but I'd like to save money better, you know? I'm just going to go ahead and order tommorow and deal with the "high cost" haha. But thanks for reply!
Yeah well I have no problem paying up for the shipping I don't me to come off as a cheap skate but I'm currently not working trying to save money and yes I do agree with you on that. I do save good parts from broken electronics, amplifiers, etc and they do come in handy but I'm not going to be reairing equipment all the time only when it fails on me. Thanks for the reply!
Yeah I agree with you on that it makes perfect sense now. I'm going to replace all the outputs and save the old good ones. Btw how do you solder them off? It doesn't look like there's holes on the board for the legs to slide by looking at circuit board. I also need some insulation for the transistors because the white paste is dryed. Ohh yeah is SGS now STMicro now?? The power supply transistors are by SGS.
Thanks Perry you make really good points!
Mmm DigiKey shows no stock for 2N6490, and exactly 2 of 2N6487G.
Mouser has lots...
I'd order from Mouser for those parts.
Yes I'm going to buy them from Mouser plus it's the 2N6488 & 2N6491 that I'm getting instead. Thanks for the reply!
If the leads are surface mounted, you remove them like the ones in the following video.
http://www.bcae1.com/temp/removingpartsfromolderorionamplifiers01.avi
SGS Thomson is now ST Microelectronics.
The white paste doesn't serve as an electrical insulator.
If there were no insulators originally, you don't need any now unless the anodizing is damaged/peeling under the transistors. If you need insulators, I'd suggest mica insulators. Either way, you'll need heatsink compound. You can get it at Radio Shack.
http://www.bcae1.com/temp/removingpartsfromolderorionamplifiers01.avi
SGS Thomson is now ST Microelectronics.
The white paste doesn't serve as an electrical insulator.
If there were no insulators originally, you don't need any now unless the anodizing is damaged/peeling under the transistors. If you need insulators, I'd suggest mica insulators. Either way, you'll need heatsink compound. You can get it at Radio Shack.
Yes!! You've answered what I was about to mention when I took the board out the heatsink and cleaned the old white compound and i
noticed the anodized peeling under the output section. So I'll have to throw some insulation pad in my order. I'll keep you posted when I get the parts and everything. Thanks!
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