Quick response thank you, the sound of your mounts with Sit is very good (I also tried in ra7’s TDV montage follower with Front end 2022), the sound is beautiful in both cases.
I’m in the stage of making the box, the most difficult!
Another big “thank you” for your support.
I’m in the stage of making the box, the most difficult!
Another big “thank you” for your support.
I'm looking at chassis ideas for this build. Modushop has a nice pair of monoblocks that might fit the bill.
https://modushop.biz/site/index.php?route=product/category&path=324
The chassis is 6.25" high internally, although appears to have decent ventilation. The perforated bottom panel eats about an inch of internal space, but the largest part seems to be the Antek AS-3430 at 5", so it would fit if upright. Internal space is otherwise 230mm x 400mm (9" x 15.75".)
The heatsinks are two (per chassis) 200mm W x 165mm H x 40mm thick, so in total 400mm x 165mm per chassis.
If the 2SK180 were mounted centered between the two heatsinks, would it be enough cooling?
Thanks.
https://modushop.biz/site/index.php?route=product/category&path=324
The chassis is 6.25" high internally, although appears to have decent ventilation. The perforated bottom panel eats about an inch of internal space, but the largest part seems to be the Antek AS-3430 at 5", so it would fit if upright. Internal space is otherwise 230mm x 400mm (9" x 15.75".)
The heatsinks are two (per chassis) 200mm W x 165mm H x 40mm thick, so in total 400mm x 165mm per chassis.
If the 2SK180 were mounted centered between the two heatsinks, would it be enough cooling?
Thanks.
Looking at the specifications on the Modushop website, each 200mm x 165mm heat sink has a C/W of 0.38, so for two the C/W is 0.19.
For comparison my amplifier build has a Modushop 300mm x 200mm heat sink with a C/W of 0.20. The heat sink gets hot but still cool enough that I can keep my hand on it indefinitely. No doubt the large aluminum chassis helps to dissipate some heat too. However I think the Modushop monoblock chassis should provide adequate dissipation.
Yes the 2SK180 should be mounted centred between the two heat sinks. Because of the physical layout and pin location of the 2SK180 you will need an aluminum angle or tee to mount the 2SK180 and that will help to distribute the heat to the two heat sinks.
For comparison my amplifier build has a Modushop 300mm x 200mm heat sink with a C/W of 0.20. The heat sink gets hot but still cool enough that I can keep my hand on it indefinitely. No doubt the large aluminum chassis helps to dissipate some heat too. However I think the Modushop monoblock chassis should provide adequate dissipation.
Yes the 2SK180 should be mounted centred between the two heat sinks. Because of the physical layout and pin location of the 2SK180 you will need an aluminum angle or tee to mount the 2SK180 and that will help to distribute the heat to the two heat sinks.
Thank you, Ben and Gianluca. Also, I'll add a category to Nelson's heat calibration chart: Not hot, which would be somewhere below Blimey hot on this chart, and seems to describe "...I can keep my hand on it indefinitely":
I'm going to have to put this on a T-shirt at some point.
I'm going to have to put this on a T-shirt at some point.
Does anyone have spare amplifier and power supply PCBs that they don't need? If so, please send me a message.
I'm interested in building this 193V Choke Loaded 2SK180 L'Amp project, but the set up fee for 1 set of boards is quite high.
Thanks!
I'm interested in building this 193V Choke Loaded 2SK180 L'Amp project, but the set up fee for 1 set of boards is quite high.
Thanks!
Which pcb company did you try?
I just checked on the JLCPCB website and the price for the amplifier pcb was $7.00 plus $1.50 for the slowest shipping. The price for the power supply board was $6.80 plus $1.50 for the slowest shipping.
These quotes were for two separate orders and shipments. The total price may be higher if the two boards are ordered and shipped together.
I just checked on the JLCPCB website and the price for the amplifier pcb was $7.00 plus $1.50 for the slowest shipping. The price for the power supply board was $6.80 plus $1.50 for the slowest shipping.
These quotes were for two separate orders and shipments. The total price may be higher if the two boards are ordered and shipped together.
They have great prices if you go with their cheap shipping.
I was wondering where danskercher got his quote.
I was wondering where danskercher got his quote.
Thanks for pointing me to JLCPCB.
I tried using Digikey's PCB builder. They give quotes from Royal Circuit, Advanced, etc. The lowest cost there was $170 for 2x boards.
Glad to find out about other PCB vendors.
I tried using Digikey's PCB builder. They give quotes from Royal Circuit, Advanced, etc. The lowest cost there was $170 for 2x boards.
Glad to find out about other PCB vendors.
$170. Wow! JLCPCB has a minimum order of, usually, 5 boards, but will still be cheaper than that by a long shot.
I'm working on another order for parts for my build and figured it might be best to check in with the group so that I'm not ordering parts I can't use. I will be building this design for a pair of 2SK180s. I have taken the parts list from what adrianrw posted a bit ago, but since he was building for the THF-51S I want to make sure the parts do not change for the 2SK180.
A few questions:
For the power supply parts:
I only found a part number for one of the bridge rectifiers, the 1000V 35A version, part # 4878-KBPC3510FP-ND. Are both rectifiers the same? I can't seem to find a reference. (Additionally, the schematic shows the part values as 600V 35A.)
General parts not on schematic:
CL60 thermistor for transformer primary windings (to work as soft start.) Specs or part number available?
Barrier terminal blocks - these are probably fairly general, but if there were a part number, I would really appreciate it.
Finally, here is the parts list.
Am I on? Am I way off? Either way, thanks for the help!
A few questions:
For the power supply parts:
I only found a part number for one of the bridge rectifiers, the 1000V 35A version, part # 4878-KBPC3510FP-ND. Are both rectifiers the same? I can't seem to find a reference. (Additionally, the schematic shows the part values as 600V 35A.)
General parts not on schematic:
CL60 thermistor for transformer primary windings (to work as soft start.) Specs or part number available?
Barrier terminal blocks - these are probably fairly general, but if there were a part number, I would really appreciate it.
Finally, here is the parts list.
| AMPLIFIER BOARD PARTS | ||
| Antek AS-3430 (dual 30VAC secondaries, 300VA) | T1 | AS-3430 |
| Hammond 193V (150mh,@3A DC) (DC filter choke for amp board) | L1 | HM1567-ND |
| Hammond 159ZJ (used to power CLC filter) (choke on power supply board) | T2 | 546-159ZJ |
| CAP ALUM 1000UF 20% 25V RADIAL | C1 | 493-10989-1-ND |
| MKP 4F 10% 350VAC PITCH 27,5 | C2, C5 | 2870-MKP1847C540355K2-ND |
| CAP ALUM 33UF 20% 25V RADIAL | C3 | 493-15435-ND |
| CAP ALUM 47UF 20% 25V RADIAL | C4 | 493-3179-ND |
| CAP ALUM 10000UF 20% 50V SNAP | C6 | 493-13364-ND |
| CAP ALUM 1000UF 20% 50V SNAP | C7 | 493-16228-ND |
| CAP ALUM 470UF 20% 63V RADIAL | C8 | 493-11032-1-ND |
| DIODE GEN PURP 100V 1A DO41 | D1,D2 | 1N4002DICT-ND |
| PTZ18B: DIODE ZENER 18V 500MW DO35 | D3 | TZX18B-TAP |
| Yellow 585nm LED Indication - Discrete 5V Radial | D4 | 516-1341-ND |
| RES 240 OHM 1/4W 1% AXIAL | R1 | RN60D2400FB14 |
| RES 2.0K OHM 1/4W 0.1% AXIAL | R2 | CMF502K0000BEEB |
| RES 10.0K OHM 1/4W 1% AXIAL | R3 | CMF5010K000FHEB |
| RES 47K OHM 1/4W 1% AXIAL | R4 | RN60D4702FRE6 |
| RES 34.8K OHM 1/2W 1% AXIAL | R5 | CMF5534K800FHEB |
| RES 1.50K OHM 1/4W 1% AXIAL | R6 | CMF501K5000FHEB |
| RES 5K OHM 1/4W 1% AXIAL | R7, R8 | RN60D5001FB14 |
| RES 220 OHM 3W .1% AXIAL | R9 | RN60C2200BB14 |
| RES 22 OHM 1/4W 1% AXIAL | R10 | RN60C22R0FB14 |
| TRIMMER 20K OHM 0.5W PC PIN TOP | RV1 | T93YA203KT20 |
| Linear Voltage Regulator IC Positive Adjustable 1 Output 1.5A TO-220-3 | U1 | LM317HVT/NOPB-ND |
| POWER SUPPLY PARTS | ||
| CAP ALUM 22000UF 20% 50V SNAP | C1,C2,C3,C4 | 338-1599-ND |
| CAP CER 10000PF 1KV Z5U RADIAL | C5 | 1255PH-ND |
| CAP CER 0.015UF 1KV Z5U RADIAL | C6 | 562R5GAS15-ND |
| BRIDGE RECT 1000V 35A | Bridge Rectifier | 4878-KBPC3510FP-ND |
| Bridge Rectifier for the 15VAC secondary winding on the Antek transformer. | Bridge Rectifier | ? |
| FIXED IND 10MH 5A 160 MOHM CHASS (59ZJ transformer) | L1 | HM1555-ND |
| RES 4.0K OHM 3W 1% WW AXIAL | R1 | RSB-4.0KRCT-ND |
| RES 40K OHM 0.1% 1/4W AXIAL | R2 | 273-MOX70034002BYE-ND |
| RES 33 OHM 3W 1% WW AXIAL | R3 | RSB-33CT-ND |
| LED RED DIFFUSED T-1 3/4 T/H | D5 | 160-1969-ND |
| Also highly recommended is a CL60 thermistor for each transformer primary winding to work as a soft start. | ||
| Barrier terminal blocks - 3 per amp https://www.mouser.com/c/connectors/terminal-blocks/?m=Eaton&number of positions=6 Position | https://www.mouser.com/c/connectors/terminal-blocks/?m=Eaton&number of positions=6 Position | |
| Switch, fuse holder, RCA jacks, binding posts, L brackets for 2SK180, wire, nylon should washers, time, a clear head, etc. |
Am I on? Am I way off? Either way, thanks for the help!
A big Meanwell on the positive side (that is: 5A or 6A quoted is what I have). This terminated in earth.
The second one that supplies the V- can just be 1Amp, as that is just signal. Minus 15V is also OK, as this side is a CCS. This means that well, you save money.
Parts are the same for THF-51S and 2SK180.
The 1000V bridge rectifier will work. Higher voltage is not an issue.
Here is a 600V bridge rectifier:
https://www.mouser.ca/ProductDetail...MCC/GBPC3506-BP?qs=y6ZabgHbY%2BwLrWgXpSfVHw==
https://www.digikey.ca/en/products/detail/mcc-micro-commercial-components/GBPC3506-BP/5040120
CL-60
https://www.mouser.ca/ProductDetail...rEv8ZE-KtN6xkzRRuwlozOL415twJtwVpOXpUkyI0Ny-Y
https://www.digikey.ca/en/products/detail/amphenol-advanced-sensors/CL-60/19756
The 1000V bridge rectifier will work. Higher voltage is not an issue.
Here is a 600V bridge rectifier:
https://www.mouser.ca/ProductDetail...MCC/GBPC3506-BP?qs=y6ZabgHbY%2BwLrWgXpSfVHw==
https://www.digikey.ca/en/products/detail/mcc-micro-commercial-components/GBPC3506-BP/5040120
CL-60
https://www.mouser.ca/ProductDetail...rEv8ZE-KtN6xkzRRuwlozOL415twJtwVpOXpUkyI0Ny-Y
https://www.digikey.ca/en/products/detail/amphenol-advanced-sensors/CL-60/19756
Hello gentlemen, where can I buy insulating washers for the THF-51S( inner diameter 4 mm and 5 mm outer)?
Thank you in advance for your answers
Toto 34
Thank you in advance for your answers
Toto 34
As for precut insulating pads, there are some on ebay.
I do not know if there are any precuts available from Mouser or Digikey.
I usually buy rectangular pads from Mouser, although now I will only deal with Digikey as they ship from Winnipeg whereas Mouser ships from Texas. Plus recently shipments from Mouser have been delayed for days due to export control holdups.
I do not know if there are any precuts available from Mouser or Digikey.
I usually buy rectangular pads from Mouser, although now I will only deal with Digikey as they ship from Winnipeg whereas Mouser ships from Texas. Plus recently shipments from Mouser have been delayed for days due to export control holdups.