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ZKIT1 overheating after anniversary mod (Read 1708 times)
JBzen
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ZKIT1 overheating after anniversary mod
02/28/21 at 23:20:37  
The year old amp ran fine. It was upgraded and ran about 20 hours off/on for 4/5 hour sessions then started to distort. It also ran hot and volume level dropped after the Milflex copper caps were added. It did sound good to me until the distortion started.

I opened it up and the 6.8k 2 watt resistor was torched. Two of the Milfex are leaking a little oil. One formed a finger point size pool of oil on the base plate. The damaged resistor is now reading over 10k so needs replaced. Will have to be ordered.

My question is what caused this? Any ideas?

Thanks
John
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AMC CD8b>XO3>Cambridge CXN2>ZDAC>ZBOX>braided silver/occ> Zrock2>CSP2+>SE84 milflex copper 25th>9AWG silver/copper braid>lii Crystal 10 in Huijgen cabinets. Ortofon 2M Black>JVC QL-F4/Otari MX5050B2>ZP3. Isolation. AC filtering. Room treatment.
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JBzen
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Posts: 1369
Re: ZKIT1 overheating after anniversary mod
Reply #1 - 03/05/21 at 09:17:51  
Answer is I installed 220 ohm series resistors instead of 220k as called for in the mod! Just to flesh it out in case anyone saw this Smiley

John
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AMC CD8b>XO3>Cambridge CXN2>ZDAC>ZBOX>braided silver/occ> Zrock2>CSP2+>SE84 milflex copper 25th>9AWG silver/copper braid>lii Crystal 10 in Huijgen cabinets. Ortofon 2M Black>JVC QL-F4/Otari MX5050B2>ZP3. Isolation. AC filtering. Room treatment.
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bobc
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Re: ZKIT1 overheating after anniversary mod
Reply #2 - 03/05/21 at 12:17:40  
Happens to the best!
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JBzen
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Posts: 1369
Re: ZKIT1 overheating after anniversary mod
Reply #3 - 03/06/21 at 12:18:06  
To add insult to injury when ordering a replacement 6.8k....hold on....did you guess yet....yes I did order a 6.8 2watt ohm resistor! Sure did point out the original fupa when those 220 ohm resistors flared up at power on!

All I can say is the right parts are on the way and so is spring. I got a lot accomplished over the past 4 months in the Charoit. Time to shift gears and dust off the yard tools.

John
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AMC CD8b>XO3>Cambridge CXN2>ZDAC>ZBOX>braided silver/occ> Zrock2>CSP2+>SE84 milflex copper 25th>9AWG silver/copper braid>lii Crystal 10 in Huijgen cabinets. Ortofon 2M Black>JVC QL-F4/Otari MX5050B2>ZP3. Isolation. AC filtering. Room treatment.
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