STK-0050 (STK-0050-II) STK-0070 Module pcb, pair
New: Two blank pcb'sDesigned to eliminate the probability of poor quality modulesDiscrete design allows for simple build, repair and excellent long term reliabilityNo worries of parts going obsolete for now and the future unless OnSemi or Toshiba fold :-) Not for beginners. Specialized tooling and skills are requiredPrior Audio Electronic knowledge and interpretation is required We will ship these pcb's internationallyAll shipping charges will be calculated by eBayUpon shipping you will receive a message providing the links to the Mouser shopping cart to order the parts and the online documents with pictures Note:No returns, all sales are final. If you change your mind after sale and item has not been shipped, we can refund if askedElectronic Components are not included in this kit, you are responsible to source and purchase as the buyerThere are other STK kits listed that contain the all the parts for you to assemble. There is also fully assembled & tested STK's made availableWeigh your options based on time, ability, cost, ease Listing is for, two blank PCB's (of your choice, STK or STK-II) We now have two pcb designs available STK-0050STK-0050-II Please indicate when you order which pcb type you require? Both types have been tested in a Pioneer SX-780. STK-0050-II offer slightly better THD performance and parts are a bit more expense Limited support The module will improve the amplifier's reliability and operational specs for sets using the STK modules up to ~90 wattsOutputs are spec'd for using TO-3PN devices, either 150W or 200W devices can be used, Toshiba or OnSemiBias adjustment included in circuit, making modules adjustable for matched performanceThese devices have been successfully used in other Pioneer, Fisher and many other models that use STK types modules.Output transistor bias adjustment is included in circuit design. This allows for the modules to be adjustable for matched performanceYou can use this design to replace STK-0040, 0050, 0070, 0025, 0029, 0039, STK-0040-II, 0050-II, 0070-II, 0080 etcPlease verify for fit in your application Expected Performance: STK-0050Total Harmonic Distortion:~< 0.02%, 20-20KHz, 4-8 ohm, 31mA bias STK-0050-IITotal Harmonic Distortion:~< 0.01%, 20-20KHz, 4-8 ohm, 31mA bias Gain = 19.37/1.25=15.5 (23.8 dB) (SX-780 design)Emitter resistors are 0.22ohm, that would be 0.22 *0.031A = 7mV across each emitter R or 14mV across the two of them, Emitter to Emitter.Increasing the bias current will make the o/p's run a bit hotter, but lower the THD slightly and increase the class "A" region. Note:Google: "STK-0050 Replacement for SX-780 and others" :Audiokarma site Read before ordering
Specifications
| Returns Accepted | ReturnsNotAccepted |
| Brand | Custom Design |
| Model | STK-0050/STK-0050-II |
| MPN | STK-0050-blank-pcb |
New: Two blank pcb’sDesigned to eliminate the probability of poor quality modulesDiscrete design allows for simple build, repair and excellent long term reliabilityNo worries of parts going obsolete for now and the future unless OnSemi or Toshiba fold 🙂 Not for beginners. Specialized tooling and skills are requiredPrior Audio Electronic knowledge and interpretation is required We will ship these pcb’s internationallyAll shipping charges will be calculated by eBayUpon shipping you will receive a message providing the links to the Mouser shopping cart to order the parts and the online documents with pictures Note:No returns, all sales are final. If you change your mind after sale and item has not been shipped, we can refund if askedElectronic Components are not included in this kit, you are responsible to source and purchase as the buyerThere are other STK kits listed that contain the all the parts for you to assemble. There is also fully assembled & tested STK’s made availableWeigh your options based on time, ability, cost, ease Listing is for, two blank PCB’s (of your choice, STK or STK-II) We now have two pcb designs available STK-0050STK-0050-II Please indicate when you order which pcb type you require? Both types have been tested in a Pioneer SX-780. STK-0050-II offer slightly better THD performance and parts are a bit more expense Limited support The module will improve the amplifier’s reliability and operational specs for sets using the STK modules up to ~90 wattsOutputs are spec’d for using TO-3PN devices, either 150W or 200W devices can be used, Toshiba or OnSemiBias adjustment included in circuit, making modules adjustable for matched performanceThese devices have been successfully used in other Pioneer, Fisher and many other models that use STK types modules.Output transistor bias adjustment is included in circuit design. This allows for the modules to be adjustable for matched performanceYou can use this design to replace STK-0040, 0050, 0070, 0025, 0029, 0039, STK-0040-II, 0050-II, 0070-II, 0080 etcPlease verify for fit in your application Expected Performance: STK-0050Total Harmonic Distortion:~< 0.02%, 20-20KHz, 4-8 ohm, 31mA bias STK-0050-IITotal Harmonic Distortion:~< 0.01%, 20-20KHz, 4-8 ohm, 31mA bias Gain = 19.37/1.25=15.5 (23.8 dB) (SX-780 design)Emitter resistors are 0.22ohm, that would be 0.22 *0.031A = 7mV across each emitter R or 14mV across the two of them, Emitter to Emitter.Increasing the bias current will make the o/p's run a bit hotter, but lower the THD slightly and increase the class "A" region. Note:Google: "STK-0050 Replacement for SX-780 and others" :Audiokarma site Read before ordering
