I did a quick test on the Altec and it rings pretty badly. I upload the image with a 2k square wave. The cheapo Chinese 10k:10K actually looks quite a bit better even without the snubber, the last image is the Chinese 10K with snubber 4700pf and 2.5k resistor which pretty much removes all the ringing produce a fairly good square wave.
No time yet to try out the snubber value for the Altec since it will take a while (I only know of trial and error with various value)
No time yet to try out the snubber value for the Altec since it will take a while (I only know of trial and error with various value)
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Hi ChuckT,
Thanks for sharing that. I am not sure of your methodology for measuring ringing with respect to impedance matching. I can definitely tell you that if there is ringing with the Altec/Peerless 15335A transformers, I do not hear it. My ARC LS7 line stage has a rated output impedance of 200 ohms and the Weiner's input impedance is in the neighborhood of 30kohms. This should be fine for using the input transformers without the RC damping network. There could be situations like what you've measured on your scope, and perhaps the damping network is required. For now, I will continue to enjoy the Weiner PBTL as I have it set-up.
Bought a decent quality 0-18(20)v bench power supply to compare sound quality at different voltages. 19v sounded good, punchy and a little more dynamic. But I think the amp sounded best at ~9v. I was surprised given I am using 4ohm MTMs, but the speakers help up fine at moderate levels. I also kept an eye on current and although I know the specs I was still surprised to see the wiener pulling only about 80mA.
I'm thinking maybe I should just get a lifepo 9v pack at 1 or 2A. Lifepo4 has worked wonders with a lot of my digtal mods...
I'm thinking maybe I should just get a lifepo 9v pack at 1 or 2A. Lifepo4 has worked wonders with a lot of my digtal mods...
The TPA3118 only pulls about 20mA in 1SPW mode at 400KHz. It's pretty efficient.
Just a heads up if you're picking batteries, the card shuts down below about 7 volts DC.
Just a heads up if you're picking batteries, the card shuts down below about 7 volts DC.
Busy night, spent a good 4 hours at it this evening.
SMT done on 4 Pro's, and a bunch of mounting kits assembled.
Packed, just need to write up shipping label: pyjamas before christmas, lacro
Ready to pack, won't fit in standard padded envelope, need to dig up some mailing boxes: BBUK, williamau, gordon_lo
tigerfoo, shochu: your amps are built, almost ready to pack. Ran out of lockwashers for the mounting kits, will pick some up tomorrow and finish those.
wushuliu: your PBTL4's are built, I did them fully assembled for testing purposes, gotta haul the input caps etc back off then they'll be ready to mail.
Then onto ChuckT's massive order 🙂 Some amps are built for this, gotta bang out a bunch more.
SMT done on 4 Pro's, and a bunch of mounting kits assembled.
Packed, just need to write up shipping label: pyjamas before christmas, lacro
Ready to pack, won't fit in standard padded envelope, need to dig up some mailing boxes: BBUK, williamau, gordon_lo
tigerfoo, shochu: your amps are built, almost ready to pack. Ran out of lockwashers for the mounting kits, will pick some up tomorrow and finish those.
wushuliu: your PBTL4's are built, I did them fully assembled for testing purposes, gotta haul the input caps etc back off then they'll be ready to mail.
Then onto ChuckT's massive order 🙂 Some amps are built for this, gotta bang out a bunch more.
Thanks. You don't have to take them off if it adds time. I can do that easy enough.
TPA Chip on Wiener Stereo gets very hot
Hi Gmarsh,
I just assembled the Wiener Stereo and connected it on my "test bench" to see if it is working.
And it does..
So far so good, but after 10 seconds of operation, the TPA chip gets so hot I can't touch it anymore.
I haven't tried to operate it for longer than 10 seconds, so I don't know if it will switch off or explode 🙂
I don't have a heatsink or thermal pad applied yet. Is this the normal behaviour, and should I only run it with some kind of heat dissipation?
Some information about the "test setup":
- Gain: 20Db
- BD and 1SPW tested, same result
- Switching frequency: 400 KHz
- Plimit: disabled
- very small speakers attached, they say "8 Ohms"
- The source is a DAC connected through a 10k stereo Pot
- Power supply: 19V 3.16A Laptop supply
The underside of the PCB also gets hot during operation (But not as much as the chip itself), so I assume my soldering was good enough to have the PowerPad connected to the PCB..
Thank you in advance for any hints or suggestions.
mabu
Hi Gmarsh,
I just assembled the Wiener Stereo and connected it on my "test bench" to see if it is working.
And it does..
So far so good, but after 10 seconds of operation, the TPA chip gets so hot I can't touch it anymore.
I haven't tried to operate it for longer than 10 seconds, so I don't know if it will switch off or explode 🙂
I don't have a heatsink or thermal pad applied yet. Is this the normal behaviour, and should I only run it with some kind of heat dissipation?
Some information about the "test setup":
- Gain: 20Db
- BD and 1SPW tested, same result
- Switching frequency: 400 KHz
- Plimit: disabled
- very small speakers attached, they say "8 Ohms"
- The source is a DAC connected through a 10k stereo Pot
- Power supply: 19V 3.16A Laptop supply
The underside of the PCB also gets hot during operation (But not as much as the chip itself), so I assume my soldering was good enough to have the PowerPad connected to the PCB..
Thank you in advance for any hints or suggestions.
mabu
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My guess would be the soldering on the thermal pad. The TPA does have thermal protection and it'll shut down if it overheats. How did you solder the chip - leads first and then from below?
Also check the soldering on the four film caps on the output filter.
The bare PCB is heatsinking enough for most applications, certainly for driving an 8 ohm load.
Also check the soldering on the four film caps on the output filter.
The bare PCB is heatsinking enough for most applications, certainly for driving an 8 ohm load.
Hi again,
My 3118 Wiener seem flawless. Even at 20 dB gain it makes my 86dB/W speakers go loud enough and they excel with nice timbre and gusto. No problem with heat at all.
But with the same power supply, 19.5V the PRO just whispers.
Questions:
1. Stand by pins are supposed to be shorted to run the PRO..contrary to the 3118 edition?
2. What settings/errors can cause the subjective 1:10 ratio in volume? Is the Voltage to low for the PRO?
3. I will buy some resistors for adjustments of the PRO gain. Values are conveniently printed on the back of the card.. But what kind/brand/watt rating of resistors do you recommend? (Just familiar with big chunky metal oxide ones rated +10 watts for speaker building..)
BR
Anders
My 3118 Wiener seem flawless. Even at 20 dB gain it makes my 86dB/W speakers go loud enough and they excel with nice timbre and gusto. No problem with heat at all.
But with the same power supply, 19.5V the PRO just whispers.
Questions:
1. Stand by pins are supposed to be shorted to run the PRO..contrary to the 3118 edition?
2. What settings/errors can cause the subjective 1:10 ratio in volume? Is the Voltage to low for the PRO?
3. I will buy some resistors for adjustments of the PRO gain. Values are conveniently printed on the back of the card.. But what kind/brand/watt rating of resistors do you recommend? (Just familiar with big chunky metal oxide ones rated +10 watts for speaker building..)
BR
Anders
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Pic of your board? What gain setting are you using on the PRO? Mine definitely does not whisper (balanced input). A suggested "gain" resistor type is on the BOM, e.g., MFR-25FBF52-16K2.
BK
BK
Thanks for the resistor advice.. BOM... obvious.. 🙂 Just thought it was outside the necessary components and didn't check.. so I just read 42 sides of thread x 3 times making sure I looked before asking ...
🙄
gain ought to be the default 20dB for the PRO.
All settings on the Wiener was very well described in manual found in GB2 thread.
So 20 vs 20 dB (only the -30 switch on ON)
I will get some really proper wiring and a switched 24 V power supply and get a pic to you if it doesent help.
Thanks again
🙄
gain ought to be the default 20dB for the PRO.
All settings on the Wiener was very well described in manual found in GB2 thread.
So 20 vs 20 dB (only the -30 switch on ON)
I will get some really proper wiring and a switched 24 V power supply and get a pic to you if it doesent help.
Thanks again
Is your audio source connected to the +/- inputs, or + and ground?
Make sure you do the former. If source and amp aren't grounded together by other means (AC power ground, etc) connect - and ground inputs together at the amp.
Make sure you do the former. If source and amp aren't grounded together by other means (AC power ground, etc) connect - and ground inputs together at the amp.
Also, you should have a bag of gain setting resistors with the amp - if you didn't get one, sorry, I'll mail one out.
Hello,
i've get a pair of Jensen JT 11 YMPC:
http://www.jensen-transformers.com/wp-content/uploads/2014/08/jt-11-ympc.pdf
can I use it instead of the input capacitors in my "The Wiener" and how?
Thanks alot for your beatufoul amp.
Regads
Guglielmo
i've get a pair of Jensen JT 11 YMPC:
http://www.jensen-transformers.com/wp-content/uploads/2014/08/jt-11-ympc.pdf
can I use it instead of the input capacitors in my "The Wiener" and how?
Thanks alot for your beatufoul amp.
Regads
Guglielmo
Yes. Remove input caps and either bridge the pads with wire if using input connectors or wire transformers directly to input pads.
Dusted off an aikido lv kit i put together a few years ago and paired it with the wiener - sounds excellent! Some serious tube magic added. I am using one of the cheap ebay dact smd attenuators. Such a bargain. Forgot how good they sounded.
Alas, now I have to manually adjust the volume, unlike my pga2310 pre w/remote I've been using...
Alas, now I have to manually adjust the volume, unlike my pga2310 pre w/remote I've been using...
Agree 3116 mates well with a tube stage in front. I also tried the latest electronic volume using Muses 72320, nice clean sound, but I definitely like the tube stage (SRPP circuit) better. I will build a Aikido buffer stage next and see.