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  #1  
Old 27th May 2015, 09:27 AM
laurielew laurielew is offline
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Default KAT 6550 amplifier schematic question

Hi all, just wondering if anyone has a schematic + parts list for KAT 6550 amplifer?
I once began buiding this amplifier in the past but have since lost the schematics + parts list.
I have plenty of Mullard GZ36 rectifier valves, could these be used in this amplifier?

Thanks.
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  #2  
Old 27th May 2015, 09:30 AM
laurielew laurielew is offline
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Default Re: KAT 6550 amplifier schematic question

Sorry, I meant GZ37 rectifier valves.
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  #3  
Old 27th May 2015, 12:09 PM
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Wieslaw Lipowski Wieslaw Lipowski is offline
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Default Re: KAT 6550 amplifier schematic question

You can look here:
Attached Files
File Type: pdf WAD 6550 sch.pdf (32.6 KB, 70 views)
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Old 27th May 2015, 03:55 PM
bob orbell bob orbell is offline
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Default Re: KAT 6550 amplifier schematic question

Hi and welcome iaurielew, I see Wiesiek has posted a Circuit Diagram and power supply, although it is for the KIT, the only difference is yours dose not have the inputs and volume pot. I have the parts list only on paper, if you want I will ask my good lady Janet to copy it and email you, please let me know, or maybe another member has the parts list on PDF. BOB
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  #5  
Old 27th May 2015, 07:59 PM
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Wieslaw Lipowski Wieslaw Lipowski is offline
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Default Re: KAT 6550 amplifier schematic question

Here are the parts list for the KIT/5U4.
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File Type: jpg KIT6550 5U4.jpg (118.8 KB, 19 views)
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  #6  
Old 27th May 2015, 11:45 PM
laurielew laurielew is offline
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Default Re: KAT 6550 amplifier schematic question

Thanks gentlemen for reply and help, both printed out o/k.
I will see what stuff I have on hand to start assembly, I did read a few years ago that 6550 grid resistors were lowered in value or perhaps it was the cathode resistors?, does anyone have imfo about this chage.

Laurie.
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  #7  
Old 28th May 2015, 12:44 AM
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Wieslaw Lipowski Wieslaw Lipowski is offline
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Default Re: KAT 6550 amplifier schematic question

KIT 6550 upgrading:
Attached Files
File Type: txt KiT6550 upgrade.txt (2.6 KB, 39 views)
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  #8  
Old 30th May 2015, 12:46 AM
laurielew laurielew is offline
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Default Re: KAT 6550 amplifier schematic question

Hi Wieslaw, thanks for help thus far, I have NOS Mullard gold pin E80CF tubes also many NOS GZ37 tubes hope these would be O/K to use.
I also have ultra-linear output transformers 4K-0-4K would these be O/K ?, the parts list calls for 4.5K-0-4.5K.
Weislaw do have a copy of the build instructions for the 6550 amp.
If so my email address is > laurielew@netspace.net.au < perhaps you would be as kind to email them to me.
I will keep you informed of my progress.

Many thanks

Laurie.
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  #9  
Old 30th May 2015, 08:07 AM
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Default Re: KAT 6550 amplifier schematic question

PM sent.
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