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Working on a Silvertone Twin Twelve 1484 amp. Uses a voltage doubler
for the HV. Output should be 480 but seeing only 375. I'll assume
these caps being 45 years old are weak resulting in the 100 volt loss.
Funny thing printed on the capacitors "Guaranteed for One Year" LOL
No tubes in the supply.Meat Plow> wrote in message news:3gr6ps.bnh.19.11@news.alt.net...
Working on a Silvertone Twin Twelve 1484 amp. Uses a voltage doubler
for the HV. Output should be 480 but seeing only 375. I'll assume
these caps being 45 years old are weak resulting in the 100 volt loss.
Funny thing printed on the capacitors "Guaranteed for One Year" LOL
What is the sag in the rectifier tube/s?
I don't understand why a conventional full way bridge was not used.In article <3gr6ps.bnh.19.11@news.alt.net>,
Meat Plow wrote:
Working on a Silvertone Twin Twelve 1484 amp. Uses a voltage doubler
for the HV. Output should be 480 but seeing only 375. I'll assume
these caps being 45 years old are weak resulting in the 100 volt loss.
Funny thing printed on the capacitors "Guaranteed for One Year" LOL
This application seems hard on caps. Had four identical tuners where a cap
performing this function failed on all at nearly the same time.
This application seems hard on caps. Had four identical tuners where a capWorking on a Silvertone Twin Twelve 1484 amp. Uses a voltage doubler
for the HV. Output should be 480 but seeing only 375. I'll assume
these caps being 45 years old are weak resulting in the 100 volt loss.
Funny thing printed on the capacitors "Guaranteed for One Year" LOL
Power surge??In article <3gr6ps.bnh.19...@news.alt.net>,
Meat Plow wrote:
Working on a Silvertone Twin Twelve 1484 amp. Uses a voltage doubler
for the HV. Output should be 480 but seeing only 375. I'll assume
these caps being 45 years old are weak resulting in the 100 volt loss.
Funny thing printed on the capacitors "Guaranteed for One Year" LOL
This application seems hard on caps. Had four identical tuners where a cap
performing this function failed on all at nearly the same time.
--
*Beauty is in the eye of the beer holder...
Dave Plowman d...@davenoise.co.uk London SW
To e-mail, change noise into sound.
** Lower voltage electros are cheap.I don't understand why a conventional full way bridge was not used.
** No such difference exists between a full wave doubler and a bridgeDoublers aren't known for their ability to supply high current so
even in new condition this supply is going to sag more than traditional.
A 100uf @ 450 vdc can't be much more expensive than a 250 vdc of theMeat Plow
I don't understand why a conventional full way bridge was not used.
** Lower voltage electros are cheap.
I know the MM 112 has a 700v HT didn't know it was derived from aDoublers aren't known for their ability to supply high current so
even in new condition this supply is going to sag more than traditional.
** No such difference exists between a full wave doubler and a bridge
circuit.
The doubler simply use two caps of half the voltage and double the uF
compared to a bridge.
Music Man amps all use doubler supplies for the HT - which has the
additional benefit of giving a half voltage supply for the output tube
screens.
ELectricity still works the same way as far as I can tell.On Thu, 11 Feb 2010 18:22:20 +1100, "Phil Allison"
phi...@tpg.com.au>wrote:
Meat Plow
I don't understand why a conventional full way bridge was not used.
** Lower voltage electros are cheap.
A 100uf @ 450 vdc can't be much more expensive than a 250 vdc of the
same value. And a doubler has twice the caps as a bridge correct?
Doublers aren't known for their ability to supply high current so
even in new condition this supply is going to sag more than traditional.
** No such difference exists between a full wave doubler and a bridge
circuit.
The doubler simply use two caps of half the voltage and double the uF
compared to a bridge.
Music Man amps all use doubler supplies for the HT - which has the
additional benefit of giving a half voltage supply for the output tube
screens.
I know the MM 112 has a 700v HT didn't know it was derived from a
doubler. I was taught that doublers are less able to supply a constant
current than a bridge. That was back in the 70's.
I don't know about *constant* current compared to a conventionalI know the MM 112 has a 700v HT didn't know it was derived from a
doubler. I was taught that doublers are less able to supply a constant
current than a bridge. That was back in the 70's.
There is no regulation. Voltage tolerances are 10% so that's a lotOn 2/11/2010 7:43 AM Meat Plow spake thus:
I know the MM 112 has a 700v HT didn't know it was derived from a
doubler. I was taught that doublers are less able to supply a constant
current than a bridge. That was back in the 70's.
I don't know about *constant* current compared to a conventional
supply--that depends on regulation (if any) and overall power supply
sizing relative to its load--but obviously doubling the voltage cuts the
current in half. That's kinda an immutable law of physics.
I know the MM 112 has a 700v HT didn't know it was derived from a
doubler. I was taught that doublers are less able to supply a constant
current than a bridge. That was back in the 70's.
This circuit uses 4 diodes and 4 caps. All were replaced yesterdayMeat Plow
I know the MM 112 has a 700v HT didn't know it was derived from a
doubler. I was taught that doublers are less able to supply a constant
current than a bridge. That was back in the 70's.
** There is more than one kind of " voltage doubler " circuit.
The two diode, two cap " full wave" doubler has no current limitations.
Clint Eastwood's famous remark applies.
** There is more than one kind of " voltage doubler " circuit.
The two diode, two cap " full wave" doubler has no current limitations.
Clint Eastwood's famous remark applies.
This circuit uses 4 diodes and 4 caps.
http://www.schematicheaven.com/bargainbin/silvertone1484.pdf
** Errr -- where did I CLEARLY describe it was or wasn't anythingMeat Plow
** There is more than one kind of " voltage doubler " circuit.
The two diode, two cap " full wave" doubler has no current limitations.
Clint Eastwood's famous remark applies.
This circuit uses 4 diodes and 4 caps.
http://www.schematicheaven.com/bargainbin/silvertone1484.pdf
** Errr - it is CLEARLY TWO "full wave" voltage doublers IN SERIES
Do try to make your insults be......well...insults.You FUCKING DIM WIT !!
Well no shit Sherlock what a fucking revolutionary idea!. How manyThe 3/4 voltage point is used for screen supply.
twat.Duhhhhhhhhhhh
** The circuit is CLEARLY TWO "full wave" voltage doublers IN SERIES** There is more than one kind of " voltage doubler " circuit.
The two diode, two cap " full wave" doubler has no current
limitations.
Clint Eastwood's famous remark applies.
This circuit uses 4 diodes and 4 caps.
http://www.schematicheaven.com/bargainbin/silvertone1484.pdf
** Errr - it is CLEARLY TWO "full wave" voltage doublers IN SERIES
** Errr -- where did I CLEARLY describe it was or wasn't anything
besides 4 diodes and 4 caps..
Do try to make your insults be......well...insults.
** Almost NONE.The 3/4 voltage point is used for screen supply.
How many
hundreds of amps use similar screen supply config.
The amp has been repaired, your idiotic arguement is moot, move along.Meat Plow
"Phil Allison"
** There is more than one kind of " voltage doubler " circuit.
The two diode, two cap " full wave" doubler has no current
limitations.
Clint Eastwood's famous remark applies.
This circuit uses 4 diodes and 4 caps.
http://www.schematicheaven.com/bargainbin/silvertone1484.pdf
** Errr - it is CLEARLY TWO "full wave" voltage doublers IN SERIES
** Errr -- where did I CLEARLY describe it was or wasn't anything
besides 4 diodes and 4 caps..
** The circuit[SLAP]
** The circuit is CLEARLY TWO "full wave" voltage doublers IN SERIES** There is more than one kind of " voltage doubler " circuit.
The two diode, two cap " full wave" doubler has no current
limitations.
Clint Eastwood's famous remark applies.
This circuit uses 4 diodes and 4 caps.
http://www.schematicheaven.com/bargainbin/silvertone1484.pdf
** Errr - it is CLEARLY TWO "full wave" voltage doublers IN SERIES
** Errr -- where did I CLEARLY describe it was or wasn't anything
besides 4 diodes and 4 caps..
The 3/4 voltage point is used for screen supply.
How many hundreds of amps use similar screen supply config.
Bugger off you drunken yeasty idle-headed pignut.Meat Plow
** There is more than one kind of " voltage doubler " circuit.
The two diode, two cap " full wave" doubler has no current
limitations.
Clint Eastwood's famous remark applies.
This circuit uses 4 diodes and 4 caps.
http://www.schematicheaven.com/bargainbin/silvertone1484.pdf
** Errr - it is CLEARLY TWO "full wave" voltage doublers IN SERIES
** Errr -- where did I CLEARLY describe it was or wasn't anything
besides 4 diodes and 4 caps..
** The[SLAP]
Coming from meathead, that's truely funny!On Sun, 14 Feb 2010 03:06:52 +1100, "Phil Allison"
phil_a@tpg.com.au>Puked:
Meat Plow
** There is more than one kind of " voltage doubler " circuit.
The two diode, two cap " full wave" doubler has no current
limitations.
Clint Eastwood's famous remark applies.
This circuit uses 4 diodes and 4 caps.
http://www.schematicheaven.com/bargainbin/silvertone1484.pdf
** Errr - it is CLEARLY TWO "full wave" voltage doublers IN SERIES
** Errr -- where did I CLEARLY describe it was or wasn't anything
besides 4 diodes and 4 caps..
** The[SLAP]
Bugger off you drunken yeasty idle-headed pignut.