That's the source.
At 9kg, it's certainly substantial.
"Temporarily out of stock".
AL-470R-S Full Aluminium chassis Round corner Large Power amplifier - Silver color version
# Custom made R30mm corner section
# 10mm thick front, rear and side plates
# One long side plate (Front or Rear) thinner to 1.5mm for easy custom opening
# 4.5mm thick top and bottom plate offer very excellent strength and still easy for custom made opening
# Made in China
# Weight :8950 (gram/Each)
# Size (mm): 470 x 320 x 80
Item No: AL-470R-S
--Temporary Out-of-stock--
Quantity (Each) Price (US$)
1 - 2 148.00
3 - 9 142.00
10 or more 134.00
At 9kg, it's certainly substantial.
"Temporarily out of stock".
AL-470R-S Full Aluminium chassis Round corner Large Power amplifier - Silver color version
# Custom made R30mm corner section
# 10mm thick front, rear and side plates
# One long side plate (Front or Rear) thinner to 1.5mm for easy custom opening
# 4.5mm thick top and bottom plate offer very excellent strength and still easy for custom made opening
# Made in China
# Weight :8950 (gram/Each)
# Size (mm): 470 x 320 x 80
Item No: AL-470R-S
--Temporary Out-of-stock--
Quantity (Each) Price (US$)
1 - 2 148.00
3 - 9 142.00
10 or more 134.00
yeah thats the one...very nice too....everything I ordered from them came promptly and correctly highly recommended
..I will have to copyright my handles and knobs though...oh yeah and drilling through 10mm aluminium for an IEC socket was not fun
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DIY Tube amp and matching speakers
Just finished a modular rig for the living room. The dimensions and shapes were matched (using the golden ratio ), so everything can be stacked and placed as needed. The name Aitoaudio is just a placeholder invented for the project.
Still missing but designed already:
Aluminum stands suitable for any module. Subwoofer: components ordered for a Rhytmik Audio Direct Servo subwoofer with a GR paper driver - crossing quite low as the speakers easily go down to 40-50 Hz.
Finished:
Speakers - Markaudio Alpair 10.2 in near aperiodic enclosures. Very nice full-range drivers. Speaker boxes are based on the ideas from Classic Golden Ratio Mar-Ken10.2 at planet10-hifi.com. More info can be found at the build log: http://www.diyaudio.com/forums/markaudio/191927-classicgr-mar-ken10-2-anyone-built-have-mods-what-do-you-think-about-them.html
Tube amp - a Chinese Sweet Peach EL-34B from an ebay auction for a decent price. After disassembly, used most of it for the amp module of the modular rig. Added a Bluetooth module and a charging iPhone/iPad dock. It already had MM and USB plus RCA aux in. The source is always Spotify high bit rate.
The white box is MDF and the top plate is 3 mm aluminum. The knobs are solid aluminum ones ordered from China. The most difficult part to source were rotary power switches (230 V) for Power on/off and BT on/off. Finally found some (made in UK) but had to cut and modify the plastic shafts to fit the 6 mm knobs - the shafts were too long and 6.3 mm in diameter.
Had to eventually replace a resistor as the original Chinese one was bad and causing sound degradation and even muting on the right channel.
Remaining: I checked the bias balance of the EL34-B's and they were quite close. Did not know the target value for this, so left it like that. But now I guess they are probably running too hot.
Power is not an issue, even now the stepped volume pot is difficult to use as step 1 is too silent and step 3 is already too loud for night usage. And there are 30 steps. Even at daytime it is impossible to use any volume above 1/4 of the scale.
Maybe it's a good idea to open up the amp again and rebias it - just have to find out the right values for EL34-B. Might as well replace a few other resistors at the same time, the originals looked a bit whimsy. And the volume pot. And some caps? And...
-
Mikko
Just finished a modular rig for the living room. The dimensions and shapes were matched (using the golden ratio
), so everything can be stacked and placed as needed. The name Aitoaudio is just a placeholder invented for the project.Still missing but designed already:
Aluminum stands suitable for any module. Subwoofer: components ordered for a Rhytmik Audio Direct Servo subwoofer with a GR paper driver - crossing quite low as the speakers easily go down to 40-50 Hz.
Finished:
Speakers - Markaudio Alpair 10.2 in near aperiodic enclosures. Very nice full-range drivers. Speaker boxes are based on the ideas from Classic Golden Ratio Mar-Ken10.2 at planet10-hifi.com. More info can be found at the build log: http://www.diyaudio.com/forums/markaudio/191927-classicgr-mar-ken10-2-anyone-built-have-mods-what-do-you-think-about-them.html
Tube amp - a Chinese Sweet Peach EL-34B from an ebay auction for a decent price. After disassembly, used most of it for the amp module of the modular rig. Added a Bluetooth module and a charging iPhone/iPad dock. It already had MM and USB plus RCA aux in. The source is always Spotify high bit rate.
The white box is MDF and the top plate is 3 mm aluminum. The knobs are solid aluminum ones ordered from China. The most difficult part to source were rotary power switches (230 V) for Power on/off and BT on/off. Finally found some (made in UK) but had to cut and modify the plastic shafts to fit the 6 mm knobs - the shafts were too long and 6.3 mm in diameter.
Had to eventually replace a resistor as the original Chinese one was bad and causing sound degradation and even muting on the right channel.
Remaining: I checked the bias balance of the EL34-B's and they were quite close. Did not know the target value for this, so left it like that. But now I guess they are probably running too hot.
Power is not an issue, even now the stepped
volume pot is difficult to use as step 1 is too silent and step 3 is already too loud for night usage. And there are 30 steps. Even at daytime it is impossible to use any volume above 1/4 of the scale.Maybe it's a good idea to open up the amp again and rebias it - just have to find out the right values for EL34-B. Might as well replace a few other resistors at the same time, the originals looked a bit whimsy. And the volume pot. And some caps? And...
-
Mikko
Attachments
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mikkokam: Next time when you need rotary mains switches check Analog Metric Limited - DIY Audio Kit or ELFA, guess you have an ELFA shop in Finland, or contact me - I have a few left.
Nice build! Like the modular design.
Nice build! Like the modular design.
The ELFA switch is very delicate (and expensive) and I have ruined two already. I have some from AnalogMetric, but I think they were one-pole only.
This switch: Ecotec-online from this (Ecotec-online | Butik) company is really heavy duty.
I my self LOVE rotary mains switches.
This switch: Ecotec-online from this (Ecotec-online | Butik) company is really heavy duty.
I my self LOVE rotary mains switches.
Mindutis: yes. Switches requiring brute tactile force make them feel solid.
Update about the bias: the Shuguangs were running at an OK level from the factory. The plate voltage was 401 V and the cathode currents were L: 52 mA and R: 53 mA - giving a a value of > 21 W which seemed high to me but the specs claim a max 30 W for Shuguangs - so it was exactly 70%. Tested a lower level and adjusted both to 40 mA giving a 412 V and thus 16.5 W. Seems enough for me (sound is the same) and maybe get a better life for the tubes?
Update about the bias: the Shuguangs were running at an OK level from the factory. The plate voltage was 401 V and the cathode currents were L: 52 mA and R: 53 mA - giving a a value of > 21 W which seemed high to me but the specs claim a max 30 W for Shuguangs - so it was exactly 70%. Tested a lower level and adjusted both to 40 mA giving a 412 V and thus 16.5 W. Seems enough for me (sound is the same) and maybe get a better life for the tubes?
RH84 from RCA Victor console
Console pull was a Canadian RCA Victor with a voltage doubler power supply. Initially I thought I would be able to use the old can caps, but the hum level was too high, so I stacked some new caps under the deck. I left the smaller cans in place, disconnected.
The chassis wasn't really suitable for leaving exposed, so I built a wooden case - open backed.
Box is finger-jointed black cherry with spalted arbutus sawn veneer faceplate.
The chassis is raised about 1/4 inch so that there is good air flow via the bottom gap and the numerous perforations in the chassis top.
Console pull was a Canadian RCA Victor with a voltage doubler power supply. Initially I thought I would be able to use the old can caps, but the hum level was too high, so I stacked some new caps under the deck. I left the smaller cans in place, disconnected.
The chassis wasn't really suitable for leaving exposed, so I built a wooden case - open backed.
Box is finger-jointed black cherry with spalted arbutus sawn veneer faceplate.
The chassis is raised about 1/4 inch so that there is good air flow via the bottom gap and the numerous perforations in the chassis top.
Attachments
RH84 from Chisholm console
Console pull - made in Port Moody,BC by Chisholm.
The IEC power entry fit (with some work) into the hole left by the octal socket which communicated with the tuner & control panel in the console.
I used the original tube sockets which were fairly good quality. Desoldering the (very well-done) original construction was a bit of work. Usually the final lug on the tube socket is the one that breaks. Either my technique is improving or I'm getting lucky: this time everything survived.
End plates are curly arbutus.
Console pull - made in Port Moody,BC by Chisholm.
The IEC power entry fit (with some work) into the hole left by the octal socket which communicated with the tuner & control panel in the console.
I used the original tube sockets which were fairly good quality. Desoldering the (very well-done) original construction was a bit of work. Usually the final lug on the tube socket is the one that breaks. Either my technique is improving or I'm getting lucky: this time everything survived.
End plates are curly arbutus.
Attachments
It sounds good, but in retrospect seems a lot of work for the modest power output it develops (~2 watts). I need to get some more measurements to try to figure out why my build isn't developing more power.
