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  •  » Can someone post gut shots of their recapped VT-22 (post 72')

#1 2011-10-04 05:49:41

beedoola
Member
Registered: 2009-05-25
Posts: 58

Can someone post gut shots of their recapped VT-22 (post 72')

I got some help and info from Hangman about what caps to get to recapp my VT-22. He graciously sent me some me some pics of a recapped V4 but the circuit in my VT-22 is a little newer and has a resistor on the 404040 cap as well as a few other wires going to places that Hman's V4 pic didn't.

Anyone have any pics they could share? Here are some pics of his v4 and bellow that are from my vt-22

http://i157.photobucket.com/albums/t54/Beedoola/DSCN3575.jpg
http://i157.photobucket.com/albums/t54/Beedoola/DSCN3576.jpg

************************************************************************

                             VT-22


http://i157.photobucket.com/albums/t54/Beedoola/IMG_1325.jpg
http://i157.photobucket.com/albums/t54/Beedoola/IMG_1326.jpg
http://i157.photobucket.com/albums/t54/Beedoola/IMG_1328.jpg

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#2 2011-10-04 06:22:52

hangman
Banned
From: Seattle Washington
Registered: 2006-09-04
Posts: 1848

Re: Can someone post gut shots of their recapped VT-22 (post 72')

I realized I had posted this picture elsewhere on the forum. 
it doesn't have the resistor either,  but its another view, and you can imagine how you could put the resistor on a terminal strip.
http://homepage.mac.com/lighterthanairflight/images/v4guts2.JPG

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#3 2011-10-04 06:45:32

hangman
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From: Seattle Washington
Registered: 2006-09-04
Posts: 1848

Re: Can someone post gut shots of their recapped VT-22 (post 72')

here is one of my vt-22s,   as you can see,  you can get creative with finding a place for the 3K resistor.   this method is a little tricky as you have to be very careful since the reverb tank is very close.  but there is a good inch and a half of clearance in this case.
http://homepage.mac.com/lighterthanairflight/images/vt22guts.JPG

when you replace that 40x40x40,  you'll drill out those rivets,  and then use screws to mount the clamp for the 50x50.   you can use another terminal strip on where that other rivet is,  and connect the 3k resistor to that,  then move the redwire that comes from the main filters to that side of the 3k resistor,  and put an axial 47uf on the other terminal strip.   the ground just has to get connected to the 50x50 and you're done.  thats the other way I do it.

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#4 2011-10-04 06:46:53

beedoola
Member
Registered: 2009-05-25
Posts: 58

Re: Can someone post gut shots of their recapped VT-22 (post 72')

thanks, I didn't want to email you cause I knew you were busy. I don't see the red wire like in my pic that runs from the other end of the resistor to the other can cap on the other side.

Also, the Electro cap that's near the two can caps in my pic has two wires that run from the negative leg - one to the can cap, another looks like its going to a jack. Do I just abandon that wire to the jack?

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#5 2011-10-04 06:59:24

hangman
Banned
From: Seattle Washington
Registered: 2006-09-04
Posts: 1848

Re: Can someone post gut shots of their recapped VT-22 (post 72')

oh I see what you mean,  that red wire goes to the main filters. 

when you drill out the rivets on the 40x40x40,  and replace them with screws,  put another terminal strip on the other side.   and attach that redwire and the other side of the 3k resistor (you might have to buy a new 10 watt 3k resistor if the leads are too short) 
then the positive end of the 47uf axial cap goes on the other end of the 3k resistor,  the two red wires that hook up to one section of the 40x40x40  then go to the positive end of the axial 47uf.  (you might have to replace those wires if they are not long enough,  but usually there is a little bit of slack)
then just make sure you hook up the ground of the axial to the negative terminal on the 50x50 can cap you use in place of the 40x40x40.   keep the other grounds connected also.  don't abandon any wires.

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#6 2013-03-08 20:43:28

beedoola
Member
Registered: 2009-05-25
Posts: 58

Re: Can someone post gut shots of their recapped VT-22 (post 72')

hangman wrote:

here is one of my vt-22s,   as you can see,  you can get creative with finding a place for the 3K resistor.   this method is a little tricky as you have to be very careful since the reverb tank is very close.  but there is a good inch and a half of clearance in this case.
http://homepage.mac.com/lighterthanairf … 22guts.JPG

when you replace that 40x40x40,  you'll drill out those rivets,  and then use screws to mount the clamp for the 50x50.   you can use another terminal strip on where that other rivet is,  and connect the 3k resistor to that,  then move the redwire that comes from the main filters to that side of the 3k resistor,  and put an axial 47uf on the other terminal strip.   the ground just has to get connected to the 50x50 and you're done.  thats the other way I do it.

So I had recapped my V4 (and VT-22 before I sold it) using this method - worked great! Thanks again for all the emails you engaged in Hangman.

My V4 has been making noise, like Hum. I thought it might be a ground issue or maybe a PT or OT issue - I measured the OT and all the measurements are close to the specs you posted in the Transformer thread.

I was poking around with my chop stick on the rear of the amp and the 50X50 cap - near the 47uf, seems to maybe have an issue. When I hit it with the chop stick the noise can either increase or decrease.

I thought it may be a cold solder connection, or maybe the cap is bad? I used F&T caps for all.

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#7 2013-03-09 21:20:45

beedoola
Member
Registered: 2009-05-25
Posts: 58

Re: Can someone post gut shots of their recapped VT-22 (post 72')

there was a weak solder joint to the ground the of 50x50 cap and the 47uf cap. Fixing that lessened the hum but there is still some hum - when the Volume is off.

I relocated the power cord ground to the OT lug as it was running on a length of wire to a terminal strip (to the chassis) near the the power and standby switches. Not sure if that helped any but there is still some noise/hum. The hum balance pot works and I have it set to about center where the noise is minimal.

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#8 2013-03-10 02:49:54

hangman
Banned
From: Seattle Washington
Registered: 2006-09-04
Posts: 1848

Re: Can someone post gut shots of their recapped VT-22 (post 72')

I would be interested to know how the voltage drops across ,R39,R40,R45, and R46 compare.   Are they similar? 

It may be that your power tubes are not all drawing the same amount of current.   And the hum from the power supply at node A is then being amplified.

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