Go back to John Ellis' post #9058. He compares and discusses TIP35C there but it pops up everywhere because it's cheap, easy to mount, and not likely to be a problem unless they (the pair) dissipate more than the heatsink can cope with if you try to use the full rated voltage supply . If you mean to fit the transistors on the same tiny PCB as that minature JLH kit version, you would know by the dimensions of TO220 V TO247 size transistors that not even their leads will fit the PCB. It could be done with extension wires, though. Also check that uprated versions also need some larger resistors
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I think if you can cool them well Tip41 may sound better as Mr Cumbb says because they write for audio on datasheet and they have lower cob.
Power rating, heat dissipation. Not much else because TIP42 isn't the fastest or most linear power transistor on the planet either. They are both "slugs" with poor linearity by comparison with present day audio transistors, though some folk think that means they will sound better if there is more harmonic distortion.
Since someone mentioned humbreaker wiring for amplifiers earlier and it naturally involves safety and possibly your life, I'll post this article link to Rod Elliott's discussion, warnings and project details for a proven design: https://sound-au.com/earthing.htm While you're there, check the class A amplifier site archive in the TCAAS archive hosted there.
Yes. I too want to use tip35c in JLH with dedicated heatsink for each(three per channel).
Good mica insulators are very fragile (& sometimes hard to find too) & that is the main problem. Modern equivalents are good enough from thermal perspective & easy to use.
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My plan is to follow original design without any compensation etc. I'm more concern about output capacitor & power supply than power transistors. I'm thinking about using 105°C rated high quality general purpose electrolytics throughout.
I took amplifier and we have listened my trial JLH in my musician friends living room.His speakers are Focal 714S. He saw it is very small and has mini cards and disappaointed and said he did not like it much and said there is much bass and not clear but i told him that it is reference amplifier and bass is normal.(voltage 20v and output capacitors are 2200uF but measures about 2000uF) He is listening to Yamaha RX V350 and we checked and saw that he had lowered bass by 10dB on Yamaha and listened this way and he put the speakers close to the behind walls and his room is a bit empty and has a bit much echo and i think because of these reasons bass became muddy and blurry and it made music not clear.
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I haven't found any information on Focal 741 model loudspeakers but as your friend is a musician, he probably needs a realistic sound level to approach that of a live performance with a focus on his type of instrument. I doubt the little mini JLH is capable of matching the 100W/channel Yamaha amplifier in any capacity other than sound quality, even with high sensitivity speakers. As you are comparing your mini version with a much larger commercial product that has additional features and uncertain eq, I would not be disappointed yet and I don't think it was a valid or fair comparison to make anyway.
There is more that could be said with some measurements to compare but that may not be easy or affordable.
There is more that could be said with some measurements to compare but that may not be easy or affordable.
HiFi Review says 91db/8ohm MMT. I've not found any freq-vs-impedence plots. But in a small room, 10W goes a long way. And the JLH clips well. (What material were you listening to?)
As you point out, the really, really, really big problem is that his room appears to be (to put it politely) "challenging"*. If his existing amp has a pre-out, then you might get closer to an apples-vs-apples comparision if you use that output to feed to the JLH (thereby using the 10db bass cut and anyother "voicing" the pre-amp/DAC is doing).
*Even IKEA now has room treatments available. Search for EILIF, NÄVERHÄGG or GUNNLAUG. Or use some local equivalent - I had carpets rolls standing on end in the corner of the room for a long while.
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His mini JLH uses TIP41 output stage semis and a lower (18V implied) supply voltage - not quite the same power of the standard spec. JLH',69 at 27V/10W but I think anyone would have trouble cooling those pictured TO220 transistors that have a very thin backplate, anyway.
This an example of the kit I think he has assembled - https://www.aliexpress.com/i/4000804836367.html
This an example of the kit I think he has assembled - https://www.aliexpress.com/i/4000804836367.html
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I know some musicians that are tone-deaf, they just play what is written on the sheet. People who are tone-deaf does not even know that. One of the most famous classical musicians was completely deaf! So what qualifies a "musician" to review and amplifier?
Perhaps if they are first violin, conductor, coach, examiner etc. but you are probably right in that being a player, good or bad, doesn't mean you can discern and judge the sound qualities of audio reproduction gear that really shouldn't have any particular qualities, according to audio pros.
FWIW, I happened to know a speaker manufacturer/designer who had contracts with the ABC (our national TV and radio broadcaster, modelled on the BBC, I suspect). He was also the conductor of a local classical orchestra, a pal, consultant and testing authority for Theile & Small, the widely known loudspeaker parameter gurus. I couldn't believe his gigantic laboratory - the size of a jet aircraft hanger plus anechoic chambers and huge rotating boom microphone structures that scanned speaker sound fields, detailing the performance of complete loudspeakers mounted flush with the smooth floor and firing upwards. Breathtaking! but with all the high spec. and performance equipment at their disposal, commercial success eluded them. Perhaps they forgot to make the boxes and cones look pretty and hire a spin merchant.
FWIW, I happened to know a speaker manufacturer/designer who had contracts with the ABC (our national TV and radio broadcaster, modelled on the BBC, I suspect). He was also the conductor of a local classical orchestra, a pal, consultant and testing authority for Theile & Small, the widely known loudspeaker parameter gurus. I couldn't believe his gigantic laboratory - the size of a jet aircraft hanger plus anechoic chambers and huge rotating boom microphone structures that scanned speaker sound fields, detailing the performance of complete loudspeakers mounted flush with the smooth floor and firing upwards. Breathtaking! but with all the high spec. and performance equipment at their disposal, commercial success eluded them. Perhaps they forgot to make the boxes and cones look pretty and hire a spin merchant.
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One of the aspects that is rarely discussed is the listening room which is as important, if not more so, than all the rest.
I had for almost 15 years my workshop in a room that was literally magical, then divorce, buyout of another house and new workshop room with similar dimensions, but since all the devices I kept and all my "Reference" devices sound very different.
We forget that everything is important in a system and mainly the listening room.
Have the experience, we know by listening to a system in a place X how it could sound in a place Y (a bit like a wine tasted at the wrong temperature) but even there, we can be wrong without counting on the agreements between the different elements of a system...
I had for almost 15 years my workshop in a room that was literally magical, then divorce, buyout of another house and new workshop room with similar dimensions, but since all the devices I kept and all my "Reference" devices sound very different.
We forget that everything is important in a system and mainly the listening room.
Have the experience, we know by listening to a system in a place X how it could sound in a place Y (a bit like a wine tasted at the wrong temperature) but even there, we can be wrong without counting on the agreements between the different elements of a system...
Hi. Tried with smps, 20v 3A and cooler is 50c approx with fluke infrared thermometer. He said bass is too much. I think he has a problem with room because he already listen to music by -10dB bass on Yamaha amp.There is half carpet on the floor and walls are almost empty. He has no knowledge on room acoustics.
This is kit
US $1.61 18%OFF | DC 12V-30V 24V Mini 1969 TIP41C 20W Amplifier Assemble Board Pure Class A Sealed Multi-turn Adjustable Resistance Module 1CH
https://a.aliexpress.com/_EzijEXf
It played quite well in my room. I am already surprised
I already suggested him some carpets onto the walls.
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I'm very sure the Focal are underdamped in the low end. He can easily tune his speaker in low frequency to room and amplifier and source by removing the synthetic wool and filling the cabinet with old Tshirts, other fabrics. Little by little. Just tuning;-)
Ridiculous.
For my home, I have more expensive shipping costs than devices and estimated delivery on July 7.
Our world has become ridiculous
For my home, I have more expensive shipping costs than devices and estimated delivery on July 7.
Our world has become ridiculous