North Carolina anyone?
- Thread starter telemike
- Start date
No nothing in particular I see some Eico, Heathkit, etc. Most of what I have been collecting is EL84 (Fisher 480, Knight 1515, Magnavox 8603 & 196, etc), but I have some Inspire 6FLV and Magnavox 185, amps too.
Hi - relatively retired to the Asheville area from western New York. I've started repairing/refurbishing low end Kenwood receivers as a hobby. Did electronics repair for 6 years in the Marines - it's slowly coming back. Already have gotten some great ideas from AK on fixing the Kenwood power switch issue. I've been recapping and relighting (LEDs) with a lot of success. It started when I bought a 1978 Kenwood KR-2090 on eBay for my garage - worked fine for about 5 months then the popping and crackling started. Recapping fixed the problem and I was hooked!
Hi NC audio people. I am in Raleigh and starting on this hobby having built a few project cars and totally rewiring them. That seems easy by comparison as everything is small now and there are different components. I acquired a non-working (but nice) Pioneer SX-850 that I am trying to debug, as it is failing dim bulb.
At this point, I have identified that if I leave only one fuse installed on the power board, the dim bulb fails. It does not fail on any of the others.
If anyone has the time to lend an assist with some common debug tips, that would be great.
At this point, I have identified that if I leave only one fuse installed on the power board, the dim bulb fails. It does not fail on any of the others.
If anyone has the time to lend an assist with some common debug tips, that would be great.
Attachments
Try a variac at 12v AC input and check your voltages per the schematic. This limits current better than a dim bulb as it skews the readings less.
I need to pick up a Variac or similar. Any recommendations? I am thinking of maybe getting a DC power supply. I think it needs to be 50v for this receiver but not positive.
HomerJSimpson
Addicted Member
I'd be willing to look at it sometime!
You need an AC variac not a dc power supply.
I appreciate that offer. I can send pics or whatever if that helps. I feel like I have a decent "base" understanding of what is going on but just lack the experience of the how to interpret what I measure.
Variac is on order...."waiting on parts"...I say the same thing when I work on cars.
Be ready to order parts maybe 5 or 6 times lol. I always think I got them all and forget one or two. The shipping is what gets ya from digikey. Did you also get Pomona or similar test lead extenders so you dot shock yourself or just put electrical tape to limit the test lead length.
I do have test leads and a few more I built that have the little "grabber" ends too. I also picked up a better DMM; a fluke 117. I learned a long time ago, tools can make a big difference. Gotta love wasting $ on shipping for the tiniest of parts. Kinda painful.
I finally got my variac and set it up as the AC source with the dim bulb in-between it and the received. I need to sort out a good diagnostic procedure as I am learning on the fly. I know that the problem is after two fuses which are the +/- AC input so I can go downstream and start testing parts. I am wondering if I should disconnect the protection board from the power board as I think the issue is on one of these two parts. Comments and advice are much appreciated!
You have a variac now build an ammeter to watch the current. Meters are sold on Amazon or eBay. You want AC amps. You don’t want to use a dim bulb. They skew the voltage readings due to the current limiting. You are already limiting the current enough with the variac. STOP using a dim bulb tester.
Leave the amp connected completely and start checking dc voltages per the schematic at 12 volts AC. It should be 1/10 the reading of the schematic.
Nice…any plans for an oscilloscope and signal generator or audio analyzer (distortion analyzer)? 8 ohm Load resistors. Sorry if being redundant and look forward to other new people in Nc joining AK.
You are not being redundant and I am glad to have this conversation as I go. I did pick up three "vintage" items with the books. I will list the specifics later today but there is a scope, bench DMM and I believe a signal generator. The price was right but I have not had time to do more than a power on test.
Here is the list of gear I picked up, but have not yet tested:
- GW Instek DMM GDM-8135
- GW Instek Function Generator GFC-802OH
- Hitachi V-650F 60Mhz oscilloscope
- B+K Precision 30Mhz oscilloscope 1479B
- Steed Class 1 Isolation Transformer STIG-55-300
- B+K Precision Dynascan 2501 Digital Storage Adapter (came with the set for free, but I doubt I will use)
Bodis Green
Member
I live in Hendersonville. I like and work on tube amps. I also have a nice little collection of Sansui solid state receivers, many different turntables, cassette decks, 8 track decks, as for speakers I have a few with largest being Altec model 19's.
