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Transformer Specs
Transformer Specs
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Old 25th June 2007, 05:43 PM   #1
cammy666 is offline cammy666  United States
diyAudio Member
Join Date: Jun 2007
Default Transformer Specs

Hey guys,
I been tryng to get some specs on some of the parts of this amp.
I been to several sites that sell hammong transformers or have data about them but i guess the model is a bit too old?
Also the schematic for the amp is quite similar but inaddition the amp had a treble potentiometer...makes me wonder if its a in between model of the amp....
i have moded the original schematic and got rid of a few uneeded wiring. Also i am going to add 2 resistors instead of the field coil speakers...there is a section in the output transformer that its for an "external amp"....Could i use this output and combine it with the existing and produce more output?
also i am going to replace the capacitors i notice that it says 8MFD...is that nowdays 8uF?
Here is a coppy of the schematic
Click the image to open in full size.
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Any sugestions into turning this into a guitar amp ?
For now i think i will change the entire layout but i am tryng to get specs on the chokes & transformers...

Will apreciate your help....THanks!!
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Old 25th June 2007, 09:47 PM   #2
cammy666 is offline cammy666  United States
diyAudio Member
Join Date: Jun 2007
Sorry about the horrible post. I was VERY hungry when i posted that and i guess all i was thinking was about was food lol.
Well here its a clarification of the message i wanted to output :P
#1) what are the specs on

A- Transformer AO-20927-1 (howmany mA can it deliver on its secondaries?

B- full specs on chokes AO-16682-2

C- Spects on output transformer....

#2) where could i find information about these above inductors.

#3) on the original schematic the values of C11, C12 & C13 are in MFD.

D) Q: Can i replace them for the modern values of uF at the same voltages and maybe different values?

#4) on the modified schematic (on previous post)

E)Can i possibly connect the un-used terminals in the output transformer to produce a higher output?. (see section 4 in pic)

I know this will problably knock out the feedback level but i can problably use a resistor to reduce it.

(i just started on tubes but i have a background on other high voltage items)

F) On section 3 i have added a resistor load to compensate the amputation of the field coils....is that a good idea?
i could not find any specs on the field coil speakers inductance....

I have a multimeter but it cant read current ;/....i am poor tryng to a amp.
I will apreciate if somebody puts me in a right direction towards this. I been reading araund for this kind of amps and i found a few usefun guides but most guides are either too much math or too simple....not in between ;/.

I figured that you more experienced people will share some tricks of the trade on this stuff....and possibly some have alredy repaired this amp or know more about it than i do.

I will apreciate any and all help

Thank you!
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