Vintage HiFi Audio Forum
Repair / Help Forum => Repair / Help => Topic started by: EmperorNorton on March 07, 2019, 03:48:13 PM
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Hey folks,
Some time back, I noticed a scratchy channel on the Hafler and put it aside for the Parasound. This past Monday I was loaned a very nice amp to "review" and it blows away the Parasound. So I pulled the Hafler back out and the right channel is still low and scratchy. I notice there are fuse holders on the back for the right and left channel. The right channel fuse is blown. I bought a couple packs of fuses at Advance Auto. (10A AGC fuses and 3A AGC fuses.). The blown fuse was a 5A 3AG. The left fuse is a reads 32 VOLT on one end and I can't make out the other end but it has a strip of metal rather than the thin wire that was on the blown fuse. I installed two 10A AGCs and the Hafler seems fine. Was just wondering if these are all basically the same fuses even though the 3AG is not the same as the AGC.
Thanks in advance
The Emperor
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I would use the 10A fuses. Read here: http://www.hifi-classic.net/review/hafler-dh-500-287.html (http://www.hifi-classic.net/review/hafler-dh-500-287.html)
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Might we inquire as to the 'very nice' amp.... inquiring minds, N@....
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Friend runs a Hafler 500 on the mains of a pair of DQ-10"s. Pretty sweet setup especially with the DQ-1 subs.
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Might we inquire as to the 'very nice' amp.... inquiring minds, N@....
Wish I could tell you more but I don't know much about it. An audio guy I know emailed me and asked if I could give the amp he built a listen and give an opinion. It has tubes on the input and transistors on the output. Big, heavy and heats up the listening room quite nicely.
That's my story and I'm sticking to it.
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Might we inquire as to the 'very nice' amp.... inquiring minds, N@....
Wish I could tell you more but I don't know much about it. An audio guy I know emailed me and asked if I could give the amp he built a listen and give an opinion. It has tubes on the input and transistors on the output. Big, heavy and heats up the listening room quite nicely.
That's my story and I'm sticking to it.
@EmperorNorton, you right - it's hybrid tube-discreet transistors power amplifier that was designed to satisfy my listening preference like the sound clarity, powerful bass and, specially, something ephemeric to describe like deep involvement to music listening. My petition to Emperor was due to he has a lot of experience and wide spectrum of audio equipment in his own possession.
However, I looking for another person now to complete independent review of this particular homebrew amp. The person with "crazy" floorstanding speakers like Legacy, Focal and Dynlavy and listening different music genres and styles.
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I listen to literally everything but wouldn't trust my self (or more specifically my family) with a loaner from anyone. I'm sure someone will volunteer though.
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If you are in the area, which seems to be often, since I live within a stones throw of the Murrysville Goodwill, you are welcome to drop by and hear this piece. It sounds great to my ear.
Just bring a few dog treats for Nellie and she'll allow you to leave in one piece.
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Hell's Bells, my man! I run Dunlavys, have in my collection an Anthem Amp2 SE (hybrid, for comparisons sake) and listen to everything from Hiphop to country to stoner metal to jazz singers in an average evening... if you're looking for 'listeners', I'm game!
Might we inquire as to the 'very nice' amp.... inquiring minds, N@....
Wish I could tell you more but I don't know much about it. An audio guy I know emailed me and asked if I could give the amp he built a listen and give an opinion. It has tubes on the input and transistors on the output. Big, heavy and heats up the listening room quite nicely.
That's my story and I'm sticking to it.
@EmperorNorton, you right - it's hybrid tube-discreet transistors power amplifier that was designed to satisfy my listening preference like the sound clarity, powerful bass and, specially, something ephemeric to describe like deep involvement to music listening. My petition to Emperor was due to he has a lot of experience and wide spectrum of audio equipment in his own possession.
However, I looking for another person now to complete independent review of this particular homebrew amp. The person with "crazy" floorstanding speakers like Legacy, Focal and Dynlavy and listening different music genres and styles.
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PM sent
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RT- how do like your Mac D100?
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RT- how do like your Mac D100?
I've not had a vast amount of time to listen (got into my system last night) but I really like it. Not a complete digital panacea, but really bring a warmer, rounder, more 'musical' presentation to the fore front.... the clarity and detail of the M2Tech I was running were great, but came with a strident and sometimes aggressive edge that I didn't always appreciate. It brings some of what I've always heard as defining the Mac house sound... rolled off harshness of the top end, a warm/round middle and a well defined 'tight' bass. Nice to simplify the system as well.... and have a remote!
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I have been using the DAC in my MAC CD player and have similar experience. TIDAL just informed me I can have MQA via my ipad, so I am hoping to give that a try this week and see if it changes my opinion
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Just to continue this thread a bit, Vince came by for his superbly self designed and built amp and a few ultrasonically cleaned slabs of vinyl. Naturally, I reconnect the Hafler and power up. The light flickers, then I see a wisp of smoke from the power switch. It's always something. Anyway, I pull it from the rack, take it to the garage, and do a little reading. Apparently the switch is one of the few weak points. I hooked it up downstairs and it powers up fine, no issues. I plan to open it and take a look but think I just need to order a switch from EBay and may not even need to solder, as it looks like there are spade connectors on it. I could use the practice though.
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Sad to read that, EN. I'll try to help you with the switch
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Thanks and not a big deal. Going to order a switch ($10) after I open up the Hafler. I would like to use that almost new solder station at least a few times a year!!
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Opened up the Hafler and looks like switch should be an easy fix. Also looks like nothing got fried.
Hopefully picking up a switch from a local forum member tomorrow (thanks, Ron!)
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looks like you may not get to use your soldering station after all.
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looks like you may not get to use your soldering station after all.
https://www.ebay.com/itm/Valve-6J1-DIY-Tube-Amplifier-Preamp-AMP-Pre-Amplifier-Board-Headphone-Buffer-Kit/264199008396?hash=item3d837cf08c:g:xD8AAOSwIo5awf~e (https://www.ebay.com/itm/Valve-6J1-DIY-Tube-Amplifier-Preamp-AMP-Pre-Amplifier-Board-Headphone-Buffer-Kit/264199008396?hash=item3d837cf08c:g:xD8AAOSwIo5awf~e)
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https://www.ebay.com/itm/Valve-6J1-DIY-Tube-Amplifier-Preamp-AMP-Pre-Amplifier-Board-Headphone-Buffer-Kit/264199008396?hash=item3d837cf08c:g:xD8AAOSwIo5awf~e (https://www.ebay.com/itm/Valve-6J1-DIY-Tube-Amplifier-Preamp-AMP-Pre-Amplifier-Board-Headphone-Buffer-Kit/264199008396?hash=item3d837cf08c:g:xD8AAOSwIo5awf~e)
Unfortunately, any tube buffer doesn't fix the influence of NFB in SS amplifier and poor engineering. That's the reason why tube and SS amplifiers sound different in most cases. And, there is a magic of tube amps sound. Not just to "mellow" tube sounding or vintage tube equipment "charm" that is actually significant high-frequencies roll-off. The best way to describe the difference is compare the guitar's (actually, any "strings") or bell's record on SS and tube amp.
Otherwise, it will be cheap and easy-peasy solution for everyone.
Moreover, the BJT and MOSFET output stage amplifiers sound different! It is all about physics. However, the listeners separate on 2 categories: music lovers and audiophiles. Audio-collector is a different sickness :)
I had an custom tube amp with power output 6 (six) W per channel that works fine with my old Focal floor-standers and friend's big floor standing speakers PMC EB1i (retail was good over $10k). I say "fine" - plays rock like Rammstein or electronic like Depeche Mode similar impression as at live concert venue.
"The engineers make planes flying. The musicians make people crying."
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https://www.ebay.com/itm/Valve-6J1-DIY-Tube-Amplifier-Preamp-AMP-Pre-Amplifier-Board-Headphone-Buffer-Kit/264199008396?hash=item3d837cf08c:g:xD8AAOSwIo5awf~e (https://www.ebay.com/itm/Valve-6J1-DIY-Tube-Amplifier-Preamp-AMP-Pre-Amplifier-Board-Headphone-Buffer-Kit/264199008396?hash=item3d837cf08c:g:xD8AAOSwIo5awf~e)
Unfortunately, any tube buffer doesn't fix the influence of NFB in SS amplifier and poor engineering. That's the reason why tube and SS amplifiers sound different in most cases. And, there is a magic of tube amps sound. Not just to "mellow" tube sounding or vintage tube equipment "charm" that is actually significant high-frequencies roll-off. The best way to describe the difference is compare the guitar's (actually, any "strings") or bell's record on SS and tube amp.
Otherwise, it will be cheap and easy-peasy solution for everyone.
Moreover, the BJT and MOSFET output stage amplifiers sound different! It is all about physics. However, the listeners separate on 2 categories: music lovers and audiophiles. Audio-collector is a different sickness :)
I had an custom tube amp with power output 6 (six) W per channel that works fine with my old Focal floor-standers and friend's big floor standing speakers PMC EB1i (retail was good over $10k). I say "fine" - plays rock like Rammstein or electronic like Depeche Mode similar impression as at live concert venue.
"The engineers make planes flying. The musicians make people crying."
My only point with that link was he keeps saying that he needs something to practice soldering on. For $6 he can do a bunch of soldering and have a fun toy when he is done.
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Oops, from my phone I didn't notice the shipping. Here, $8 shipped. Or just search eBay for whatever cheap kit you want to solder together...
https://www.ebay.com/itm/AC12V-6J1-Valve-Pre-amp-Tube-Board-Headphone-Amplifier-Acrylic-Case-DIY-Kits/112685340207?hash=item1a3c91d62f:m:m8ecC2EoYWceauyFWqOy14g (https://www.ebay.com/itm/AC12V-6J1-Valve-Pre-amp-Tube-Board-Headphone-Amplifier-Acrylic-Case-DIY-Kits/112685340207?hash=item1a3c91d62f:m:m8ecC2EoYWceauyFWqOy14g)
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My only point with that link was he keeps saying that he needs something to practice soldering on. For $6 he can do a bunch of soldering and have a fun toy when he is done.
STL, my point was about searching an Audio Graal - I pretty jealousy to people who happy listening the music with phone and earplugs ;) And, I couldn't afford most of the really high-rated and high definition stuff- for me smth like Focal Scala / Bricasti design / Gryphon Legato ...
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Oops, from my phone I didn't notice the shipping. Here, $8 shipped. Or just search eBay for whatever cheap kit you want to solder together...
It changes all!
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Well, to keep the party going (since I am listening to a Wanda Jackson double LP "Let's have a party"
on Charley that I bought at Jims back in the 80s), I got a new switch from Ron today and the Hafler is rocking the room. It took a while to pop the old one out but I was persistent and, after I got it out, I realized that I was unsure of the old configuration with the 3 wires and the 3 pins on the switch. Then, I remembered I posted a picture earlier on this very thread, which, of course, made everything easier.
I should mention that I stopped at the new pop-up Goodwill store down the road and bumped into STaL, on his lunch break, I presume.
It was quite the busy day, as I stopped at the Social Security office at 12:10, only to learn that every office in the US of A closes at noon every Wednesday. then stopped at G & G Fitness just over the hill, and found that they were closed too (permanently). Well, I guess it wasn't that busy of a day.
Thanks to Ron for the switch and, I'm signing off as ZZ Top informs me that Jesus just left Chicago.......