Elekit TU8600S triggers current protection on one or the other channel at power on - Page 10

vkung · 1st January 2021, 07:55 PM

No

I will check each soldering points on the problem side.
IMG_2146.HEIC - Google Drive

soi · 1st January 2021, 08:13 PM

I don't think so. Without analyzing the schematic in details, I think the voltage reference (U102/U202) is to set a threshold beyond which the 300B bias gets enabled. On the other hand, the SCR is to shut down B+ under fault conditions. Mixing up the two would cause B+ to shut down or B+ to never get enabled.

vkung · 1st January 2021, 11:42 PM

It is not mixing up..

CentralCoast · 2nd January 2021, 04:04 AM

I spent all day working on the amp. The amp plays fine on both channels after I toggle power a few times.

It has power on issues. I will keep working on it. The 3 amp voltage regulator for the 300b heater filament is getting my attention now.

Several sources indicate that the 300b requires 3 amps or more during cold start. I will continue to work on it.

Since the amp works after finally getting it started, I am focused on turn on transients.

EvanMcG · 2nd January 2021, 06:17 PM

Genelex Gold Lion for 300B and ECC83. RCA for ECC82

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1st January 2021, 07:55 PM	#91
vkung diyAudio Member Join Date: May 2005 Location: Vancouver BC Canada	No I will check each soldering points on the problem side. IMG_2146.HEIC - Google Drive

1st January 2021, 08:13 PM	#92
soi diyAudio Member Join Date: Jun 2020 Location: SF Bay Area	I don't think so. Without analyzing the schematic in details, I think the voltage reference (U102/U202) is to set a threshold beyond which the 300B bias gets enabled. On the other hand, the SCR is to shut down B+ under fault conditions. Mixing up the two would cause B+ to shut down or B+ to never get enabled.

1st January 2021, 11:42 PM	#93
vkung diyAudio Member Join Date: May 2005 Location: Vancouver BC Canada	It is not mixing up..

2nd January 2021, 04:04 AM	#94
CentralCoast diyAudio Member Join Date: Sep 2019 Location: San Luis Obispo, CA	I spent all day working on the amp. The amp plays fine on both channels after I toggle power a few times. It has power on issues. I will keep working on it. The 3 amp voltage regulator for the 300b heater filament is getting my attention now. Several sources indicate that the 300b requires 3 amps or more during cold start. I will continue to work on it. Since the amp works after finally getting it started, I am focused on turn on transients.

2nd January 2021, 06:17 PM	#95
EvanMcG diyAudio Member Join Date: Jan 2021	Genelex Gold Lion for 300B and ECC83. RCA for ECC82