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Old 4th January 2003, 05:52 PM   #21
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Default 5687 update

hello to all the ppl that help me b4,
i need advice again..

ok..i have wired up pin 8 (CT)according to the circuit.
as for filament supply..this still confuse me guys..sorry for being so slow on picking it up..

i have build a 12volts DC supply ..so how do i wire it up?? 12volts to pin 4 and the supply grd to pin 5? or 12volts to pin 4 and pin5?

i connect positive multimeter to pin 4 and neg to pin 5..reading 6.3volts only..this is for 12volt pin4..grd pin 5.
shouldnt it suppose to be 12volts?

thanks guys..appreciate it..

rgds
tone
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Old 4th January 2003, 06:28 PM   #22
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Default HEATERS

Hi,

Assuming you built according to the diagram you posted earlier...

Just connect the heater to pins 4 & 5 it does not matter which way around.

When you measure put the plus lead of your DVM at either pin at the minus lead at a ground point of your chassis.

You should now measure 12VDC approximately.

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Old 5th January 2003, 12:32 AM   #23
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Default 5687 update

hi frank..thanks for the advice.
attach is the supply filament circuit that i have build..
connect A to pin 4 and connect B to pin 5..measure by plus meter to either pin...negative meter to grd..right!..
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Old 5th January 2003, 12:39 AM   #24
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Default HEATERS...IT IS WINTER HERE AFTER ALL

Hi,

Quote:
connect A to pin 4 and connect B to pin 5..measure by plus meter to either pin...negative meter to grd..right!..
So,it is working correctly now?

Quote:
When you measure put the plus lead of your DVM at either pin at the minus lead at a ground point of your chassis.
Sorry...this was confusing.

When you measure put the plus lead of your DVM at either pin and the minus lead at a ground point of your chassis.

Cheers,
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Old 5th January 2003, 06:17 AM   #25
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Default 5687

hi frank,
is the chasis grd suppose to connect to the CT of the 200v-0-200v, if so im not getting any reading at all..i did the measure by plus to pin4/5 and minus lead to 200v CT..but if plus lead to pin4 and minus lead to pin 5 ..im getting 6.3volts..the tube did light up..but very deem..will keep u update..will try to hookup everything and hope there is sound..thanks frank..
appreciate it very much..

cheers,

rgds
tone
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Old 5th January 2003, 11:29 AM   #26
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Default 5687 update

hi frank!
the preamp works wonderfully!!..no hum what so ever...sounds very good..
thank you very much..


rgds,
tone(happpyman)
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Old 12th January 2003, 08:37 PM   #27
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Tone

I thought i would ask how you liked your preamp now that you have used it a few days. Do you have a final power supply schematic written down to share with us?

Joe
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Old 13th January 2003, 12:00 AM   #28
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Default PREAMP

Hi,

Quote:
Do you have a final power supply schematic written down to share with us?
I look forward to see a complete circuit diagram with B+ noted etc.

As it is there are a couple of points worth errr....pointing out:

1/The preamp inverts absolute phase with respect to its' input.

2/Output impedance is quite high since it's taken from the anode.

3/Volume control can be improved on with a switched attenuator.

The reason I ask is because I see ways to improve on the PSU and with the additinion of an OPT it would be a nice universal preamp.

Just some thoughts,
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Old 13th January 2003, 04:07 AM   #29
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Default 5687 filament

hi frank & burnedfingers,
attach is the complete circuit..soon will be adding some 10H chokes..

sound: very warm, detail, excellence bass,dynamic.

frank: thank you for ur kind advice.

rgds,
tone
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Old 13th January 2003, 04:14 AM   #30
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Default 5687 update

here's another circuit.

frank: any idea how to convert the circuit to use one 5687 perchannel? running series or parellel..i think i need more power..im using a parellel LM3875(2 perchannel) Gainclone..

thanks again

rgds
tone.
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