I have the older sibling Three Thirty nocturne. I’ve been under the hood of a number of 330’s and man, there are a lot of variations in this series. One of the main differences is some had pre-out/power-in jacks and some did not. I was in a forum discussion a while back regarding the Nocturnes and I had stated my unit had this option. A member had tried to correct me saying that wasn’t possible. I took pictures of course which settled the dispute then and there but as folks started to look at their models, it became apparent that the 330 and 530’s were a loose bunch. There are other differences as well. I know manufactures made changes mid- run to many series but HK seems to have a knack for it. Good video
Definitely, at least 3 “official” series documented and I’m sure much more was done in between them. Honestly a great amp but the noise floor in the preamp was something I chased for a while and changed every single resistor in the tone / preamp paths. I could only put it down to the pots or just the wiring runs back and forth. Pull those jumpers though and feed straight into the amp and its super clean and quiet 👌 Fine for less sensitive speakers either way though 🙃
Cute little amp, glad you have finally sorted it out. These thermal compensation diodes deserve a second look though in my opinion, VD1212s and STVs are infamous for going open and taking the entire amp with them.
I wanted to mess with them but I was warned a while ago not to touch them as apparently a substitute wasn’t possible… I could have the wrong info and perhaps it explains the touchy bias… I didn’t look into it given that the components were low risk for sourcing replacements but ill have a other dig around :)
@@whatcouldgowrong7914 I'm not familiar with the schematic of this particular amp, but usually an appropriate quantity of 1N4148/50s in series does the trick. Most of these unobtainium ones were just that- multiple diodes in series, depending on required voltage drop and enclosed in a single mould. X-Ray Tony B suggested a different type as a suitable replacement, offering even closer matching rd curve, but I cannot remember the model, think it was one of Vishay's. I'll check... found them; UF1004.
Hi, I have Harman / Kardon AVR 171S which is behaving very weirdly. It's a 7.2 channel network receiver. Off Late, I could notice that the Front Left channel has lower gain than the Front Right channel. If I automatically calibrate the speakers using the provided microphone, then this issue is getting rectified and sound is coming correctly from all the channels, however the volume level get greatly reduced due to which I need to turn up the volume in order to get good quality sound reproduction. However this is not convenient and if I reset the unit to factory setting, etc, then again the earlier issue is re-occurring. One more issue I would like to highlight is that there are about 6 HDMI outputs, and the MHL o/p HDMI is not generating any signal and hence I had to connect my Shield TV media device to another HDMI o/p to make it work. In my understanding, I don't think there is any issue with the amplifier MOSFET transistors. So it could be something to do with the o/p circuit, but I am not that technical to comment further. Can you provide any insights based on your experience and can guide me with your suggestions?
I do it as a hobby and whatever I cross paths with on my travels. Friends etc I do work for but I was warned by many a repair tech who are semi retired that doing this for a living with customers who don’t pay for methodical work and hours required isn’t worth the aggravation 🙏🙂
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I have the older sibling Three Thirty nocturne. I’ve been under the hood of a number of 330’s and man, there are a lot of variations in this series. One of the main differences is some had pre-out/power-in jacks and some did not. I was in a forum discussion a while back regarding the Nocturnes and I had stated my unit had this option. A member had tried to correct me saying that wasn’t possible. I took pictures of course which settled the dispute then and there but as folks started to look at their models, it became apparent that the 330 and 530’s were a loose bunch. There are other differences as well. I know manufactures made changes mid- run to many series but HK seems to have a knack for it. Good video
Definitely, at least 3 “official” series documented and I’m sure much more was done in between them. Honestly a great amp but the noise floor in the preamp was something I chased for a while and changed every single resistor in the tone / preamp paths. I could only put it down to the pots or just the wiring runs back and forth. Pull those jumpers though and feed straight into the amp and its super clean and quiet 👌 Fine for less sensitive speakers either way though 🙃
Cute little amp, glad you have finally sorted it out. These thermal compensation diodes deserve a second look though in my opinion, VD1212s and STVs are infamous for going open and taking the entire amp with them.
I wanted to mess with them but I was warned a while ago not to touch them as apparently a substitute wasn’t possible… I could have the wrong info and perhaps it explains the touchy bias… I didn’t look into it given that the components were low risk for sourcing replacements but ill have a other dig around :)
@@whatcouldgowrong7914 I'm not familiar with the schematic of this particular amp, but usually an appropriate quantity of 1N4148/50s in series does the trick. Most of these unobtainium ones were just that- multiple diodes in series, depending on required voltage drop and enclosed in a single mould. X-Ray Tony B suggested a different type as a suitable replacement, offering even closer matching rd curve, but I cannot remember the model, think it was one of Vishay's. I'll check... found them; UF1004.
Hi, I have Harman / Kardon AVR 171S which is behaving very weirdly. It's a 7.2 channel network receiver. Off Late, I could notice that the Front Left channel has lower gain than the Front Right channel. If I automatically calibrate the speakers using the provided microphone, then this issue is getting rectified and sound is coming correctly from all the channels, however the volume level get greatly reduced due to which I need to turn up the volume in order to get good quality sound reproduction. However this is not convenient and if I reset the unit to factory setting, etc, then again the earlier issue is re-occurring. One more issue I would like to highlight is that there are about 6 HDMI outputs, and the MHL o/p HDMI is not generating any signal and hence I had to connect my Shield TV media device to another HDMI o/p to make it work.
In my understanding, I don't think there is any issue with the amplifier MOSFET transistors. So it could be something to do with the o/p circuit, but I am not that technical to comment further. Can you provide any insights based on your experience and can guide me with your suggestions?
I don't know... I would say the number of people who still listen to FM still outnumber the people who use the headphone jack.
Gotta ask is this a hobby or do you run a repair store?
I do it as a hobby and whatever I cross paths with on my travels. Friends etc I do work for but I was warned by many a repair tech who are semi retired that doing this for a living with customers who don’t pay for methodical work and hours required isn’t worth the aggravation 🙏🙂
@@whatcouldgowrong7914 Thanks for that!