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    The ticket says "Buzzing and grinding". Two...

    The ticket says "Buzzing and grinding". Two pots, the range switch and several electrolytics bad. I replaced all the electrolytics, which is something I hestiate to do, but it was warranted.

    Here...
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    A Rare one: Wallace AC5075-XT

    On my bench today...

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    56671

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    PS: Even with the ally chassis it weighs a ton!
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    If you remove the NFB by connecting the right...

    If you remove the NFB by connecting the right hand end of the 1.5K to ground instead of the output, do you still get ringing? If so, then the cause is not the feedback. Note the frequency of the...
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    I bet it doesn't cost them $60. Maybe $3.

    I bet it doesn't cost them $60. Maybe $3.
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    Guitar amps!...

    Guitar amps! https://voxamps.com/en-gb/product/mv50-boutique/
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    Quite awful isn't it? I take it the resonace...

    Quite awful isn't it? I take it the resonace frequency is a mechanical thing i.e the frequnecy at which is internals vibrate. Not suitable for use in a combo I'd say.
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    Korg NuTUbe dataseet

    I see these Korg 6P1 Nutubes are showing up at distribution at around US$50 each (ouch) for rather dismal performance. I pity the guys who buy into these and have to replace them. Expensive glass...
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    Synchronous rectifiers I expect.

    Synchronous rectifiers I expect.
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    241

    That is an ICEPower PSU / power amp module. No...

    That is an ICEPower PSU / power amp module. No schematics. No chips ( custom ICEower) are available. You might get lucky but more than likely you will have to replace it.
  10. New user with contrived question answered by new...

    New user with contrived question answered by new user with link to helpful site. Mmmm! Smell the spam.
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    A completely different approach that is 100%...

    A completely different approach that is 100% immune to radiated fields and has a variety of springs reverb sounds and doesn't go CRASH if you whack it yet still costs about the same (or less) is...
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    Jazz called it.. the HT fuse is likely open, not...

    Jazz called it.. the HT fuse is likely open, not the PT.

    The drop would have caused the tube to fail so blowing the HT fuse. It's anybody's guess when the LT fuse holder failed.
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    The power transformer magnetizing current is...

    The power transformer magnetizing current is quite distorted so there will be odd order harmonics present. That said if you hold the tank close to the PT there is a lot of fundamental there which...
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    An alternative to high pass filters it the twin T...

    An alternative to high pass filters it the twin T notch. The one shown below inserted between the reverb output and the recovery grid will give you more than 30dB of attenuation at 50Hz. With a...
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    It suggests that both windings are open circuit. ...

    It suggests that both windings are open circuit. That would be most unusual. Can you recheck and also check from SP1 to SP2. Check the filaments are glowing. If you get hundred of volts AC between...
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    HT-18 IR Thermal Imaging Camera 220 x 160. Medium...

    HT-18 IR Thermal Imaging Camera 220 x 160. Medium resolution but it has been very helpful to identify overheating components quickly. I got it new and cheap from a charity store.
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    Counterfeit LM3886TF

    No surpises here, but out of interest and a warning to those who might be tempted.

    I buy lots of LM3886TF's, from trusted sources. However I did get curious and got a couple of cheapies off...
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    It sound more like a track/ solder joint/...

    It sound more like a track/ solder joint/ connection has gone high impedance. If something were loading the DC supply to that extent, the diodes would likely burn out as would the transformer. A...
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    I seem to recall you are correct HH. The...

    I seem to recall you are correct HH. The official gov site I looked at advised to ask for the DoC before starting the process. Watch this space...
  20. Probably of no help whatsoever is a copy of the...

    Probably of no help whatsoever is a copy of the schematic for the EMC350. It's all I have. Sorry!

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    I have made a formal request to them for a copy...

    I have made a formal request to them for a copy of the Declaration of CE Conformity which they are legally obligated to have and provide on request. It seems I have a moral obligation to follow this...
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    A coda. Instead of the unreliable yellowing LEDS...

    A coda. Instead of the unreliable yellowing LEDS I mentioned above I decided to give some 4ft tube type LED lights go. I have a couple of these in another workroom and they've been OK. What follows...
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    They told me that hasn't worked for some time....

    They told me that hasn't worked for some time. Ask them and you shall receive. I've found Ashdown to be a most helpful bunch of people.
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    These are for over current protection. The...

    These are for over current protection. The collectors are a maximum of +/-15V. You'd want them to sink all the current that the drivers Q206/ Q207 can provide under over current conditions, so say...
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    It does make it confusing. In the BOM the 7204...

    It does make it confusing. In the BOM the 7204 is called out as "70467204 SDS-7204". The cross ref matches SDS-7024 with Peavey p/n 70407204. The substitutes are 2N6557, MPS-U10 and later on...
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    The Peavey cross ref gives 2N6557 for the SD7204....

    The Peavey cross ref gives 2N6557 for the SD7204. Here is the data sheet for it showing the package and the power rating.
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    Thye more I look at I the less sure i am about the max CE voltage...
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    The "300V 10mA" seems to be a typo on...

    The "300V 10mA" seems to be a typo on amplifiedparts. It's actually a 300V 500mA 10W ( 2W free air) part. It has a metal heatsink tab TO202 package.

    The 10mA and 115V average for this circuit...
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    Ah! In that case you've solved that problem at...

    Ah! In that case you've solved that problem at least!
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