Dear members!
I have an Unison Research Triode 25 EL34 Amplifier in use.
Last day, during tube rolling (I changed from EL34 to 6CA7) by a matched Quartett I blew one of the fuses, (in one channel) which I want to replace.
It´s those 5x20mm type and I assume (it says 500/250V), it´s 500mA.
Anyway, could I be right with my assumption as well as, is somebody owning a service manual or at least schematic of this amp?
I once had an issue with this amp, the manufacturer sits in Italy and is not very responsive. The German distributor either.
I believe, that one of the tubes was defect (although I used it well before in another amp). I never had this experience with tube rolling, can tubes break that easy? No idea, that´s strange to me....
Thanks in advance and best regards
Hans
I have an Unison Research Triode 25 EL34 Amplifier in use.
Last day, during tube rolling (I changed from EL34 to 6CA7) by a matched Quartett I blew one of the fuses, (in one channel) which I want to replace.
It´s those 5x20mm type and I assume (it says 500/250V), it´s 500mA.
Anyway, could I be right with my assumption as well as, is somebody owning a service manual or at least schematic of this amp?
I once had an issue with this amp, the manufacturer sits in Italy and is not very responsive. The German distributor either.
I believe, that one of the tubes was defect (although I used it well before in another amp). I never had this experience with tube rolling, can tubes break that easy? No idea, that´s strange to me....
Thanks in advance and best regards
Hans
You installed four new tubes and a 500 ma fuse was cut... right? Before that, you had no problem with the old tube?
Hi hooman!
Thanks for the reply!
I already had these tubes in use with this and another amp and never had problems with these or the old tubes I was swapping…. it just happened when I turned the amp on; I heard a short „blob“ and when it was warming up, and I tried to adjust the bias I saw, that the right channel had no signal to do so. Do you know this amp?
It‘s having a meter, to do so, 1/3 is auto bias, the rest adjustable….
Thanks in advance
Hans
Thanks for the reply!
I already had these tubes in use with this and another amp and never had problems with these or the old tubes I was swapping…. it just happened when I turned the amp on; I heard a short „blob“ and when it was warming up, and I tried to adjust the bias I saw, that the right channel had no signal to do so. Do you know this amp?
It‘s having a meter, to do so, 1/3 is auto bias, the rest adjustable….
Thanks in advance
Hans
