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Vintage Ampeg Head and Cab , 197?

#27
Micheal (bongokid) brought his SVT over to me and i checked it out. it's a really great old amp. it needed two 12BH7's and a 12DW7 phase inverter since they were all noisey from vibration (internally). i replaced them with NOS philips ones and they sound great (with no noise). the hum balance pot was broken, so i replaced it with a NOS 100 ohm allen bradley and then set the hum balance to spec. i replaced the standby switch (which wasn't original), repaired some broken solder connections on the molex connector, repaired some faulty (popping) solder connections on the poweramp pcb, cleaned all of the tube sockets and set the bias and driver tube balance (its bias was way off when it arrived). to top it off, i replaced the grill cloth with some old original 70's ampeg cloth that i had (it had newer aftermarket cloth on it which looked really out of place).

BTW, at idle, after dialing it in, this is one of the quietest ones that i've worked on.

here's a pic of it with it's 'new' (vintage grill cloth):

bongokidSVT-01.jpg
 
#30
Awesome catch! I can't wait to move out to either San Fran or San Diego in the next few years and meet some of the TB'ers out there! I feel like I could learn quite a bit from several of them just in meeting them. :D
 
#31
johnk_10 said:
Micheal (bongokid) brought his SVT over to me and i checked it out. it's a really great old amp. it needed two 12BH7's and a 12DW7 phase inverter since they were all noisey from vibration (internally). i replaced them with NOS philips ones and they sound great (with no noise). the hum balance pot was broken, so i replaced it with a NOS 100 ohm allen bradley and then set the hum balance to spec. i replaced the standby switch (which wasn't original), repaired some broken solder connections on the molex connector, repaired some faulty (popping) solder connections on the poweramp pcb, cleaned all of the tube sockets and set the bias and driver tube balance (its bias was way off when it arrived). to top it off, i replaced the grill cloth with some old original 70's ampeg cloth that i had (it had newer aftermarket cloth on it which looked really out of place).

BTW, at idle, after dialing it in, this is one of the quietest ones that i've worked on.

here's a pic of it with it's 'new' (vintage grill cloth):

bongokidSVT-01.jpg
Click to expand...

You do awesome work John! :D
 
#32
After John's beautiful job on this SVT, I had him take my Ampeg V4 guitar cab and transform it into a BEAST.. He ultimately took out the semi original 12" speakers (2 ampeg, 2 music man) and replaced this with (4) 250 watt eminence 2512's which will total 1000 watt power. He also replaced the casters with some pop off's, as well as changed my input from 1/4" to speak on and was recessed for easier loading.
IMG_0050.jpg


here's a pic of the cab without the grill.
IMG_0051.jpg

roll it.....
 
#37
Bongokid said:
Hey guys. Just purchased this rig from a gentlemen in Escondido CA. He said it was a '72 but wanted to see if you guys could see anything that might say different. Plays real nice other than one or two speakers might need to be serviced.
Let me know if you guys can tell me anything. Just from some lookin around, all the 6550's say GE on them, i see a couple GT's..
Click to expand...

Nice amp congrats. Looks just like the '73 I owned many years ago. 72, 73 no matter, that's a great amp.
 

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