Hi;
Best wishes for you all for 2011.
I am quit making my own start delay into a old (1988)TL922 amp.
I made two primary transformer start up delays for : A for filament supply.
B for HV sequencial
start-up supply.
A little explanation about my substantial modifications concerning the
TL922 power supplys.
By powering-on I switch all ready a resistance of 10 ohm/50W into the
primary of the filament transformer circuit.
After about 3 minutes I switch on the HV tension with in series a resistance
of 47ohm/50W by means of timer T1
I mean time I also swich-out the 10 ohm/50 W of the primary of the filament
transformer by means of that same timer T1'
After 5 minutes I switch-out the 47 ohm/50W resistor of the primary of the
HV-supply transformer by means of timer T2.
This principle works quit very well and it is very safely for the start-up
life time of the 3-500Z tubes ?
But I was a little bit scary about the cuurent (1A over 47 ohms is 47W
!!!)witch flows of the HV-supply
without charge during the 47 ohm/50W resistance was in circuit..
Just some bleeders resistances over the HV-supply C's and over the whole
supply as stabilisation of the power HV-supply output.
I could not believe it was about 1A ???
That was quit a good reason to ask some question around ?
Today I leave the whole AMP under supply for a whole day nothing happens
around.
May I conclude everything is normal behind my old Tl922 ?
So a big story but I like to now some others guys opinion and experiences
around this remarquable
consumption of the HV-supply and measurement I made around a TL 922.
73's Jean ON4AEF.
> ----- Original Message -----
From: "Jim W7RY" <w7ry@inbox.com>
> To: "BEHIELS JEAN-PIERRE" <ON4AEF@base.be>; <amps@contesting.com>
>> Sent: Wednesday, January 19, 2011 4:20 PM
>> Subject: Re: [Amps] Fireing up a old Tl922 amplifier.
>>
>>
>>> How long is your delay? Should be no more than .5 second to 1 second.
>>>
>>> 73
>>> Jim W7RY
>>>
>>>
>>> --------------------------------------------------
>>> From: "BEHIELS JEAN-PIERRE" <ON4AEF@base.be>
>>> Sent: Wednesday, January 19, 2011 12:18 AM
>>> To: <amps@contesting.com>
>>> Subject: [Amps] Fireing up a old Tl922 amplifier.
>>>
>>>> Hi,
>>>>
>>>> I am busy to fireing up a old Kenwood TL922 amplifier(1985).
>>>> I have already build in a start-up system for both filament and high
>>>> tension power supplys by means of two homebrew timers,and a series
>>>> small
>>>> resistances in
>>>> de secundairys of both transformers(filament 10 ohm-HV 47 ohm both
>>>> 50W).
>>>> Both valves are not mounted(running with no charges no consume).
>>>> By power-on the unit I saw that the resistance of 47ohm/50W into the HV
>>>> supply is becoming very hot.
>>>> I have made some measurements during start up around this resistance
>>>> and
>>>> measure 47 V over this resistance.
>>>> This means that the HV power supply without charge consume 1A idling
>>>> current !!!
>>>> Question is this normal ?
>>>> After the timing sequence the resistance is normally pulling out of the
>>>> system and the supply runs like it must be I suppose,nothing abnormal
>>>> happens further !!
>>>> No overheating behind the amplifier box or whatever,no smoke or burning
>>>> and heating components.
>>>> Just the 10W bleeders over the capacitors warm up a little (can easely
>>>> take my hand on it hi )
>>>> I was wondering while this is so mutch or not ?
>>>> Did I leave the amp a lot many hours under supplying condition to the
>>>> give the HV-capacitors the time to reforme after sutch long time(if
>>>> this
>>>> is the reason) ???
>>>> Could this last also a reason of the fenomene ?
>>>> Or is 1A just normal standby current value for this amp .....
>>>>
>>>> Regards Jean ON4AEF.
>>>>
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>>>>
>>>>
>>>>
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>>
>
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