jose

No problem Soren. I bought the Kemet on Mouser at 30€/ea . Less than that is a fantastic price.

Ok, I know my amps are not very pretty , but I like the simple front. I made the 20mA versión so it need a big heatsinks

12$/ea?

My KGSSHV C is Alive!!!

Thanks Sorenb. I´m interested.

Beautiful:

Today I could dedicate time to amp. It took me very little time regulate. The balance was 0~1 volt (derived a little between both values) and offset was 0~0,5volt (derived a little too).

Thanks all Dr. Gilmore, What value recommended for HV?

CT pin. I feel like a stupid . Spend two hours to review all and spend your time too

Thanks guys. Yesterday I was until 2 AM checked the amps. All components is OK, correct solders, all conections OK. Finally, I moved the trafo wires and I saw something, when I moved it the led shine sometimes. I saw that the PSU socket was rare: I desoldered this piece and a pin on the socket base was broken. I don´t remember too tightly. I had had chinese sockets with this problem but not a Phoenix. So I turned on and all was OK. Leds shine, volt ok. I adjusted the current to 1 volt (20 mA) and then I went to sleep. Tonight I´m working with the balance and off set. Thanks for your patience.

First start. I'm not lucky I have all VRs adjusted to mid point I turn on R channel; both leds shine. A second later, led arround PZTA56, don´t shine (+rail). Turn off the amp and the this led shine again!!! (until the capacitor discharges). The Led arround PZTA06 shine all time. Check Volt on + rail: 1,5 volt. Volt on - rail: -15 volt. No smoke or blown. L channel, it´s similar to R; the same led is shining and then stop.

Ok, I´m ready to check it.

I changed the LT1021-5 for LT1021-10. Now, psu it´s fine. HV: 402,5 volt. / -401,5 volt Bias, 578 volt. LV: 15,4 volt/ -15,1 volt. Thanks

OK, but a balanced input is a good alternative... Imagine that in the future, you have a balanced source. You only need to spend a little time and very little money. Edit; My KGST has 3 unbalanced input and 1 balanced input

Thanks!!!

Thanks for your help guys. Yes it's 5 volt. I don't know why use this and I don't remember reading anything about. I ordered this on digikey. In any case, it's my fault and is quite easy to solve. So the correct is the 10 volt versión?

I have a problem with the PSU. Started without load and grounds connected to safety earth. Trafo: 360volt AC x2 and PSU ready for 400 volt DC LV: OK; +15,1 volt and -15,4 volt. Bias: OK; 579 volt at the test point. HV: both sides +119 volt and -119 volt. I don´t see something wrong or blown. Any idea? What can be wrong?

Thanks Nicholas.

Thanks. Yes, all caps are 680uF/550VDC.

Thanks mwl168. I was wrong because I saw the pcb layout and ordered a 360 Volt trafo for 400VDC Well If I use 450 VDC PSU (All I need is change four resistors on de the PSU and it's easy), Need I change something on amp boards?

My progress I ordered a toroid with 360X2 @350mA but I don´t know what I can do. With this trafo, a 400 vol output is a overkill? I would like use a 20mA configuration on amp.

Thanks for the replies. I used nylon screw and aluminum oxide Insulator on my KGST whithout problem. Yes, you haven´t a large press but it´s safe. Well, now I have the Aavid poly sulfide shouder washer too: http://www.mouser.es/ProductDetail/Aavid-Thermalloy/7721-10PPSG/?qs=%2fha2pyFaduh6C0mWin5INmhh82HyIUQkqhWvlgOyq9gqLaH17qc%2f0A%3d%3d But I´m not sure.

Is safe use a metal screw for attach 10m90s to to the heatsink? I bought the poly sulfide shouder washer but I´m not sure if this is enough

Thanks mwl.

Resistors, please check. 100 O, 0.5 W gate stoppers for DN2540, and sense resistors 18 660-MF1/2CCT52R1000F 75 O, 0.5 W (source resistor for output cathode sink) 2 660-MF1/2CC75R0F 180 O, 0.5 W (source resistor for output current load) 4 660-MF1/2CC1820F *182 R 500 O. 0.5 W 4 660-MF1/2CC4990F *499R 1.0 kO, 0.5 W gate stopper for 10M90S 6 660-MF1/2CC1001F 1.2 kO, 0.5 W (source resistor for input current sink) 2 660-MF1/2CC1211F *1,21K 2.0 kO, 0.5 W 4 660-MF1/2DCT52R2001F 5.1 kO, 1 W/500 V 4 294-5.1K-RC 124 kO, 0.5 W, 350 V rated 8 660-MF1/2CC1211F 220 kO, 2 W, 500 V rated 8 660-PCF2C224K 300 kO, 0.5 W, 350 V rated 4 660-MF1/2CC3013F *301K 500 kO, 0.5 W, 350 V rated 4 660-MF1/2CC4993F *499K And trimpot... Im´not sure about last reference (5K) please, any alternative? 20 O multiturn trimmer for output current sink—set current to 17 mA 2 652-3299W-1-200LF 100 O multiturn trimmer for output current load—set current to 7 mA 4 2-3299W-1-101LF 500 O multiturn trimmer for input stage current sink—set current to 1.33 mA 2 652-3299W-1-501LF 5 kO, 0.75 W multi-turn trimmer for input stage balance 2 652-3252W-1-502LF