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Are these SET amps

S

sansui0104

Active Member
Hello I am asking if these are SET amps, the add states , Each amp uses 4ea. 6L6GC, 2ea. 5U4GB, 1ea. 6SN7 & 1ea. 6J5 driver, single triode. Tubes are vintage RCA & GE, all test good, all tubes included. I had just bought the amps, Conn Organ 60-watt mono tube amps. Thank you for your help. Bruce
 

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No, those are Push-Pull. Even if they were single-ended, they would not be SET unless the 6L6 was strapped for triode output; it's not a triode by nature, it's a pentode (actually a beam tetrode, which is a work-around for a pentode).

Nice looking amps, by the way. Is there some reason you want them to be SET? FYI, SET is usually low-powered, because single-ended is lower power output than P-P, and triodes are generally lower power output than pentodes. If these are actually rated at 60 watts output per side, I'd bet they are just plain old P-P pentodes. Not that it makes them bad, not at all!
 
Thank you for you replies. May I ask why is the trnasformer the weak link? No I was not looking for SET, but his add states they are (single triode) , I thought SET amps were very low watts, Are push pull considered good.
 
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sansui0104 said:
Thank you for you replies. May I ask why is the trnasformer the weak link? I was not looking for SET amps, I thought SET amps were very low watts, Are push pull considered good.
Click to expand...

I can't answer your question about the transformer, but yes, P-P designs are fine, as are SE (SET or not). Some people prefer the sound of one over the other. I have both and I like both. They do sound different to me, but I can't really explain how. It's much easier to get a lot of power output out of P-P.
 
sansui0104 said:
Thank you for you replies. May I ask why is the trnasformer the weak link? I was not looking for SET amps, I thought SET amps were very low watts, Are push pull considered good.
Click to expand...

There are many fine examples of both topologies. One isnt better than the other. With all things being equal, its all in the ear of the beholder. Im a SE guy, but I do like PP as well. The best way I can describe it...SE sort of makes the music hang in the air, while PP throws it at you.
 
I wouldn't worry about the output transformers right now. For PP they look to be pretty good size. I think Jay was probably thinking these may be organ amplifiers, and in some cases the frequency range they are designed for are not what we would want in a hi-fi unit.

The bigger worry for me is that they haven't been refurbished. The original caps are all still there. Someone put on new binding post. The fact that they did that and didn't replace the caps tells me they didn't know what things to do first, or maybe they just threw on some binding post to sell it. Either way, there's some work to do on them before they are daily drivers.
 
sansui0104 said:
Thank you for you replies. May I ask why is the trnasformer the weak link? No I was not looking for SET, but his add states they are (single triode) , I thought SET amps were very low watts, Are push pull considered good.
Click to expand...

The transformer may be limited in bandwidth because frankly organs did not have to produce sound across the listening range. This is what also makes then good candidates for guitar amps. But do check before you dismiss it. A transformer that goes from 20hz to 15khz is useable.
As to triodes maybe you misread something? The 6j5 is itself a single triode the 6sn7 are dual triodes. Here is a schematic that may be of use.
6L6amp_schematic (2).jpg
 
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cubby01 said:
I wouldn't worry about the output transformers right now. For PP they look to be pretty good size. I think Jay was probably thinking these may be organ amplifiers, and in some cases the frequency range they are designed for are not what we would want in a hi-fi unit.

The bigger worry for me is that they haven't been refurbished. The original caps are all still there. Someone put on new binding post. The fact that they did that and didn't replace the caps tells me they didn't know what things to do first, or maybe they just threw on some binding post to sell it. Either way, there's some work to do on them before they are daily drivers.
Click to expand...

Yes they are organ amps, I think the owner just put the new post on to sell them. He did claim they sound really good and ran quit cool. Is there direction I can take to make them daily drivers. I am not very handy at replacing caps.
 
sansui0104 said:
Hello I am asking if these are SET amps, the add states , Each amp uses 4ea. 6L6GC, 2ea. 5U4GB, 1ea. 6SN7 & 1ea. 6J5 driver, single triode. Tubes are vintage RCA & GE, all test good, all tubes included. I had just bought the amps, Conn Organ 60-watt mono tube amps. Thank you for your help. Bruce
Click to expand...

Bruce, I saw the listing. The way I read it the seller was saying that the 6J5 is a single triode, which it is. Not sure exactly why he pointed that out. (Edit: I see bluelobster beat me to that conclusion :))

sansui0104 said:
Is there direction I can take to make them daily drivers. I am not very handy at replacing caps.
Click to expand...

This is a great place to learn, it's really not that hard to swap in updated parts and this is a helpful group. Your other option is to find someone (preferably local) that can do the work. Using the phone book to look for guitar tech's that repair tube amps might be a place to start.

Good luck with the buy.
 
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cubby01 said:
Bruce, I saw the listing. The way I read it the seller was saying that the 6J5 is a single triode, which it is. Not sure exactly why he pointed that out.



This is a great place to learn, it's really not that hard to swap in updated parts and this is a helpful group. Your other option is to find someone (preferably local) that can do the work. Using the phone book to look for guitar tech's that repair tube amps might be a place to start.

Good luck with the buy.
Click to expand...

Hi Buck I am glad you seen the add, I state like I owned them, I bid high enough where I am 100% sure, I could be wrong. Yes everyone here is very helpful. So what do you think Buck the seller claims them to be sounding very good and runs cool. I did take into consideration they might be built to be used in a specific application.
 
cubby01 said:
Bruce, I saw the listing. The way I read it the seller was saying that the 6J5 is a single triode, which it is. Not sure exactly why he pointed that out. (Edit: I see bluelobster beat me to that conclusion :))



This is a great place to learn, it's really not that hard to swap in updated parts and this is a helpful group. Your other option is to find someone (preferably local) that can do the work. Using the phone book to look for guitar tech's that repair tube amps might be a place to start.

Good luck with the buy.
Click to expand...

Thanks yes good idea, i live in a area that I will have to ship them out of state. Sure I can try to replace them myself. I know how to read the values i think, just not sure what to get as far as brands and where.
 
sansui0104 said:
Hi Buck I am glad you seen the add, I state like I owned them, I bid high enough where I am 100% sure, I could be wrong. Yes everyone here is very helpful. So what do you think Buck the seller claims them to be sounding very good and runs cool.
Click to expand...

Probably does. Seeing that it's got a switch to set to the proper mains voltage (115,120,125, etc) that is a plus and if set correctly over the years probably helped it out. By the way, there's a number on the chassis 48495-3, I found reference to Conn catalog part 48495-003 which says "AMPLIFIER ASSY, 30 WATT"., may or may not be the same chassis.
 
cubby01 said:
Probably does. Seeing that it's got a switch to set to the proper mains voltage (115,120,125, etc) that is a plus and if set correctly over the years probably helped it out. By the way, there's a number on the chassis 48495-3, I found reference to Conn catalog part 48495-003 which says "AMPLIFIER ASSY, 30 WATT"., may or may not be the same chassis.
Click to expand...

Hi Buck thanks for the heads up I did check also, I emailed the seller.
 
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