It´s probably also good for my newly found NOS V15-IV MR🙂.
Need to fit it and the psu into the two boxes. They are just sittin´ there waiting😀
Looks like it, am not exactly sure whay they do, but it sounds terrific as a MM riaa. You can see the thread here in a Danish forum:
HIFI4ALL Forum: Diy AR PH3 Riaa
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vinylengine calculator gives Secondary Parallel Resistor of 12K7 for a desired load of 100 ohms with 1:10 step up transformer and 47K of phono stage load.
This is the simplistic but incomplete calculation, as the DC resistances of the step-up transformer are not included.
See for example this link, where the same step up ratio and load impedance using a Lundahl step-up transformer calls for a 15k7 parallel resistor:
K&K Audio | Moving Coil Step Up Guide
The stupid thing is, that SACThailand/SilkAudio doesn´t specify any calculation on their homepage (or maybe I missed it) nor the DC-resistance (or maybe I missed that too 🙂 🙂
Think, I might have to go look again.
Think, I might have to go look again.
All the write is:
SILK MC-220A is very versatile model. It can be connected in two ratio. With 1:10X step up, it will have 100 ohm load. With 1:20X step up, it will have 25 ohm load. These two connections can cover the need of 90% of all MC cartridges on the market; however, in case that special requirement is needed, we are happy to do custom winding to exactly match your cartridge requirement.
Their homepage:
SAC Thailand
SILK MC-220A is very versatile model. It can be connected in two ratio. With 1:10X step up, it will have 100 ohm load. With 1:20X step up, it will have 25 ohm load. These two connections can cover the need of 90% of all MC cartridges on the market; however, in case that special requirement is needed, we are happy to do custom winding to exactly match your cartridge requirement.
Their homepage:
SAC Thailand
Hasse SACT Thailand load your step up 1:10 or 1:20 with 12K for measurements
SAC Thailand
"Figure 1. Shows MC-220A (1:20X) frequency characteristic with 12K load. Linear response is from 10Hz to over 25KHz within 0.1dB While -3.0dB point is extended beyond 40KHz. "
"Figure 3. show MC-220A with 1:10X step up ratio to 12K load. Its frequency response is linear from 10Hz to around 20KHz with small boosting after 20KHz and smoothly drop down to -3.0dB at around 56KHz. This is surprising for most Audiophile but if we compare our SILK MC-220 to other MC step up transformer, the boosting in high frequency of other step-up transformers are much more severe as depicted in figure 6."
SAC Thailand
"Figure 1. Shows MC-220A (1:20X) frequency characteristic with 12K load. Linear response is from 10Hz to over 25KHz within 0.1dB While -3.0dB point is extended beyond 40KHz. "
"Figure 3. show MC-220A with 1:10X step up ratio to 12K load. Its frequency response is linear from 10Hz to around 20KHz with small boosting after 20KHz and smoothly drop down to -3.0dB at around 56KHz. This is surprising for most Audiophile but if we compare our SILK MC-220 to other MC step up transformer, the boosting in high frequency of other step-up transformers are much more severe as depicted in figure 6."
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No, but I think I could.
I mailed them when dealing with som hum issues, and they were very helpful and
answered promptly, so I might just do that.
Why didn´t I think of that??? 🙂 🙂 🙂
I mailed them when dealing with som hum issues, and they were very helpful and
answered promptly, so I might just do that.
Why didn´t I think of that??? 🙂 🙂 🙂
Never thought of measuring the DC resistances and do the math yourself?
By the way: don't be too obsessive with load impedance. It's best to check how the phono sounds in your system and adapt the load impedance of the cartridge to optimize your sound.
By the way: don't be too obsessive with load impedance. It's best to check how the phono sounds in your system and adapt the load impedance of the cartridge to optimize your sound.
Agreed, but for the future (cartridges) I thought I would put a couple of extra RCA sockets in the SUT-box, parallel them with the output sockets and the make a bunch of RCA plugs with built in resistor to do the loading. Wouldn´t hurt to be able to write the correct value on them (even if it sounds awful), right??
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