Voltage stabiliser

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juansweetpotato
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Re: Voltage stabiliser

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StroppyChops wrote: Sat Jun 24, 2017 6:55 pm

Second, the pause for thought. I recently bought a small practice amp that hums quietly with no inputs, as soon as I plug in a lead it howls. I figured it was munted and contacted the seller to organise a replacement, which I'm yet to go and collect. I'm now wondering if I'm going to have a harmonic issue with any sound gear. My keyboard doesn't hum, but I haven't tried it with an amp yet. A cheap pair of crap speakers hum and pulse when plugged into my PC - although I've just swapped in the new UPS and that seems to have abated.
My problem was always that I liked Fenders. Their single coil pickups are famous for causing hum.

I am presuming you have one of those fat expensive well- shielded jack leads.You can check if the lead is faulty by plugging it in and turning the keyboard volume down. If it's still noisy, it's that expensive lead you bought in SEA.

I am​ also presuming you have no earthing in your apartment. There could be some problem plugging keyboard and amp into the same cheap extension lead I think. I'd hate to think what the magnetic field looks like in PP. Electric potential problem?

Any fluorescent lights nearby? Any other noise generating equipment? Have you tried unplugging the UPS/s, / voltage regulators? Best switch off and unplug all electrical items except for the amp and keyboard to check.

I suspect it is your amp as you predicted already. Faulty caps or tubes.

I'm still researching low voltage / variable Hertz associated problems, but I have a feeling it could well be an added cause.
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Re: Voltage stabiliser

Post by Mr Curious »

tubes? I doubt it.
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Re: Voltage stabiliser

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Mr Curious wrote: Sun Jun 25, 2017 9:33 am tubes? I doubt it.
My fav guitar amp is the Fender Twin Reverb. Valve set on eBay for $158! I guess you didn't hear about the 2011 reissue?
http://www.ebay.com/itm/Tube-Set-Fender ... SwaG9XJMKY
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Re: Voltage stabiliser

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vladimir wrote: Sun Jun 25, 2017 6:07 am we switch on the hwc and the aircon drops.
At one place where I lived a few years back, if we had the AC on then turned on the hwc, the breaker would trip. Ultimately, this killed the hwc.
The landlady from hell wanted me to pay for a new hwc. When the sparky came to check it out, he confirmed that it was the breaker that was too small that was causing the problem.
I refused to pay, and the landlady from hell allowed us to move out after only renting for six weeks. Dumb bitch.
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Re: Voltage stabiliser

Post by Mr Curious »

juansweetpotato wrote: Sun Jun 25, 2017 10:26 am
Mr Curious wrote: Sun Jun 25, 2017 9:33 am tubes? I doubt it.
My fav guitar amp is the Fender Twin Reverb. Valve set on eBay for $158! I guess you didn't hear about the 2011 reissue?
http://www.ebay.com/itm/Tube-Set-Fender ... SwaG9XJMKY
We're talking about someone in Cambodia right?

old old news. (I prefer the Deluxe Reverb). Boutique amps run tubes mostly. Last I read the Russians were the only major source of valves, as they are called by some. I seriously doubt anyone in Cambodia is running a Twin or Marshall stack unless it's sold state. It would be a surprise if someone even brought over a Princeton. Old point to point gems? It would be stupid. OD stomps and a SS sure.

at a big Khmer wedding bash I had RIGHT next to where I stay in KC the guy was running at least 6 big ass SS amps for the stage. Had NO PROBLEM blasting us out of bed at 5am doing a sound check and then running the setup for the better part of 2 days.
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StroppyChops
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Re: Voltage stabiliser

Post by StroppyChops »

juansweetpotato wrote: Sun Jun 25, 2017 7:59 am
StroppyChops wrote: Sat Jun 24, 2017 6:55 pm

Second, the pause for thought. I recently bought a small practice amp that hums quietly with no inputs, as soon as I plug in a lead it howls. I figured it was munted and contacted the seller to organise a replacement, which I'm yet to go and collect. I'm now wondering if I'm going to have a harmonic issue with any sound gear. My keyboard doesn't hum, but I haven't tried it with an amp yet. A cheap pair of crap speakers hum and pulse when plugged into my PC - although I've just swapped in the new UPS and that seems to have abated.
My problem was always that I liked Fenders. Their single coil pickups are famous for causing hum.

I am presuming you have one of those fat expensive well- shielded jack leads.You can check if the lead is faulty by plugging it in and turning the keyboard volume down. If it's still noisy, it's that expensive lead you bought in SEA.

I am​ also presuming you have no earthing in your apartment. There could be some problem plugging keyboard and amp into the same cheap extension lead I think. I'd hate to think what the magnetic field looks like in PP. Electric potential problem?

Any fluorescent lights nearby? Any other noise generating equipment? Have you tried unplugging the UPS/s, / voltage regulators? Best switch off and unplug all electrical items except for the amp and keyboard to check.

I suspect it is your amp as you predicted already. Faulty caps or tubes.

I'm still researching low voltage / variable Hertz associated problems, but I have a feeling it could well be an added cause.
I have almost zero knowledge of what constitutes good gear, although I'm drawn to Fenders also, hence this purchase. The local guy that sold it to me gets these things in shipments for overseas - I suspect each time a school band or band camp buys new gear they think they'll donate the old equipment to individual poor people who's lives would be improved by owning such a thing and have no idea they're acquired by shipment by some enterprising individual who starts a business. Identical to the second-hand bicycles for the poor programs you see in wealthy countries.

Nah, I have a $4 lead from one of the musical instrument sellers near Psaar Thmei - could not source a decent lead in town. I'm sure they exist, but couldn't find one. Yep, no earthing at all, and yep, fluros aplenty. No other noise generating equipment though. Will continue to fiddle, but settling on it being a damaged amp,

Thanks for your thoughts.
Bodge: This ain't Kansas, and the neighbours ate Toto!
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juansweetpotato
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Re: Voltage stabiliser

Post by juansweetpotato »

StroppyChops wrote: Sun Jun 25, 2017 12:52 pm
juansweetpotato wrote: Sun Jun 25, 2017 7:59 am
StroppyChops wrote: Sat Jun 24, 2017 6:55 pm

Second, the pause for thought. I recently bought a small practice amp that hums quietly with no inputs, as soon as I plug in a lead it howls. I figured it was munted and contacted the seller to organise a replacement, which I'm yet to go and collect. I'm now wondering if I'm going to have a harmonic issue with any sound gear. My keyboard doesn't hum, but I haven't tried it with an amp yet. A cheap pair of crap speakers hum and pulse when plugged into my PC - although I've just swapped in the new UPS and that seems to have abated.
My problem was always that I liked Fenders. Their single coil pickups are famous for causing hum.

I am presuming you have one of those fat expensive well- shielded jack leads.You can check if the lead is faulty by plugging it in and turning the keyboard volume down. If it's still noisy, it's that expensive lead you bought in SEA.

I am​ also presuming you have no earthing in your apartment. There could be some problem plugging keyboard and amp into the same cheap extension lead I think. I'd hate to think what the magnetic field looks like in PP. Electric potential problem?

Any fluorescent lights nearby? Any other noise generating equipment? Have you tried unplugging the UPS/s, / voltage regulators? Best switch off and unplug all electrical items except for the amp and keyboard to check.

I suspect it is your amp as you predicted already. Faulty caps or tubes.

I'm still researching low voltage / variable Hertz associated problems, but I have a feeling it could well be an added cause.
I have almost zero knowledge of what constitutes good gear, although I'm drawn to Fenders also, hence this purchase. The local guy that sold it to me gets these things in shipments for overseas - I suspect each time a school band or band camp buys new gear they think they'll donate the old equipment to individual poor people who's lives would be improved by owning such a thing and have no idea they're acquired by shipment by some enterprising individual who starts a business. Identical to the second-hand bicycles for the poor programs you see in wealthy countries.
Spot on I would​ say
I have a $4 lead from one of the musical instrument sellers near Psaar Thmei - could not source a decent lead in town. I'm sure they exist, but couldn't find one. Yep, no earthing at all, and yep, fluros aplenty. No other noise generating equipment though. Will continue to fiddle, but settling on it being a damaged amp,

Thanks for your thoughts.
Have you tried the American run guitar shop just off 271? He seems a nice chap. Best music shop in PP.
Phone to check he's there first.
Skip 077472663.
Last edited by juansweetpotato on Sun Jun 25, 2017 12:59 pm, edited 1 time in total.
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StroppyChops
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Re: Voltage stabiliser

Post by StroppyChops »

juansweetpotato wrote: Sun Jun 25, 2017 12:57 pmHave you tried the American run guitar shop just off 271? He seems a nice chap. Best music shop in PP.
Phone to check he's there first.
Skip 077472663.
No, this was an opportunity purchase - $25 for a Fender practice amp. Turned out to be an expensive paperweight, as it happens. I'd bought a keyboard from this guy before, so already had relationship.
Bodge: This ain't Kansas, and the neighbours ate Toto!
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