yodo is a distortion and VCA based on the sunn((O))) beta-lead preamp, where the distortion stage is based on CMOS hex inverters
(CD four-zero-six-nine).
It has a colour section to shape bass, mid and treble.
there’s a VCA on the output, plus an extra CV controllable feedback path with a send/return section.
BEWARE: yodo is a self-conscious machine and can speak on its own.
//Backlog/////
This is an eurorack adaptation of the sunn((o beta lead amplifier circuit, I used to play a rhodes through this amp, and i really liked the tone. Many guitar amps are quite limited in the frequency spectrum, because they’re thought for guitars, this one is not, at least to me, i loved it and I thought, why don’t you make it for eurorack? And so I did, this thanks to fender ( who bought sunn((o in the 60/70ies) that released all the service manuals on their website, go and have a look because its a goldmine. The amp runs on +-15v and uses CMOS hex inverters in the distortion section. Apparently hex inverters where used a lot in audio circuits because the had a very similar “structure” as opamps, but that’s all I know, there are various distortion circuits which uses them though.
I followed the schematic as it is except for a couple things:
-The drive pot: i used a dual gang 100k instead of 1M, way easier to find, had to tailor a bit the values around the pot and scale them down following a 1:10 ratio;
?
-I omitted the send and spring reverb section, which uses a very particular 30k s-taper pot. I could have worked it around by using a linear pot and putting resistors in parallel in order to obtain that curve, but at the same time I wasn’t interested in having a spring reverb ( as i have already some nice digital reverbs in my effects chain );
Since I wanted it to be a bit more versatile I added a few things:
I felt it was essential to have a VCA at the out, as they are extremely useful and lovely.
Since I used 2 sections of a 2164 for the VCA and I still had 2 available, I decided to add a second vca on a feedback loop, this to test and see how much more tonal variation i could get. The nice thing about FB loops is that they create an oscillation, which can then be shaped on the EQ section of the circuit, and at certain settings when increasing the feedback amount you can clearly hear a sequence of tones harmonically related to each other.
I spent some time as well trying to find a way to get CV control over the EQ section, but without success.
For the panel I went for a classic chinese pattern.
How much is my shipping?
Shipping is automatically calculated before you submit your payment information. Simply add items to your cart and proceed to the checkout page, where you'll be offered shipping options and their prices. In the UK it's normally around £4 for order values under £150, and free above that. Shipping to mainland EU is typically between £7 and £20, depending on the shipping method and the size and weight of the order.
Do you ship to my country?
Almost certainly - the site will give you an estimate of shipping costs if you add an item to the cart and then enter your country and postcode. If you have specific requirements (such as if you prefer UPS over FedEx, for example) then let us know in advance and we'll try to work something out for you.
Shipping methods
We use a combination of Parcelforce, DPD, Royal Mail and UPS for the UK, and for international orders it's either Royal Mail, UPS, DHL or FedEx depending on where you are in the world. If you have a particular preference then try to let us know BEFORE you order so we can look into it for you. Please note that there may occasionally be additional shipping charges if you live in a remote area, depending on what surcharges are applied by the shipper. We'll get in touch to discuss this with you in such cases.
Dispatch times
For UK orders, we normally dispatch the same working day if we get the order before 15:00. If you have a really urgent situation then of course drop us an email before ordering and we'll always do our absolute best to accommodate you.
For international orders, we normally dispatch the same day if we get the order before 13:00 but again, occasionally it might be the next day before we can send it out, and sometimes FedEx or UPS may come a little earlier than scheduled which would also push an order into the next day.
Shipping times
Since April 2020 the couriers we use have suspended guarantees for shipping times, so even though we're paying them for priority services - 24-48 hours for most of the world - in practice it's often an extra day on top and sometimes it can be longer.
There is absolutely nothing we can do about this unfortunately. If you are outside the UK and it's a life-or-death situation where you absolutely MUST have that passive mult for the next day then... it may be better to find a local supplier.
Saturday shipping
If you're in the UK and you order before 15:30 on a Friday then we can send something for a Saturday delivery (NB: this applies to UK mainland addresses only). The success rate with DPD is about 95% so it's worth a punt most of the time. Please note that if you select Saturday shipping on an order placed earlier in the week, we'll wait until Friday to ship it.
Pre-orders
If a product is listed as a pre-order, it means we've ordered it from the supplier but it's not physically in stock yet. The product listing will include an estimated shipping date based on the best information we have from the supplier, but do bear in mind this is subject to change and is not a guaranteed date.
If you place an order containing a mixture of in-stock and pre-order items, we'll normally hold off on shipping anything until the pre-order item(s) have arrived, rather than splitting it into multiple shipments. If you need the in-stock items sooner, we'd recommend placing separate orders. As always, please get in touch if you have questions.
Product Overview
yodo is a distortion and VCA based on the sunn((O))) beta-lead preamp, where the distortion stage is based on CMOS hex inverters
(CD four-zero-six-nine).
It has a colour section to shape bass, mid and treble.
there’s a VCA on the output, plus an extra CV controllable feedback path with a send/return section.
BEWARE: yodo is a self-conscious machine and can speak on its own.
//Backlog/////
This is an eurorack adaptation of the sunn((o beta lead amplifier circuit, I used to play a rhodes through this amp, and i really liked the tone. Many guitar amps are quite limited in the frequency spectrum, because they’re thought for guitars, this one is not, at least to me, i loved it and I thought, why don’t you make it for eurorack? And so I did, this thanks to fender ( who bought sunn((o in the 60/70ies) that released all the service manuals on their website, go and have a look because its a goldmine. The amp runs on +-15v and uses CMOS hex inverters in the distortion section. Apparently hex inverters where used a lot in audio circuits because the had a very similar “structure” as opamps, but that’s all I know, there are various distortion circuits which uses them though.
I followed the schematic as it is except for a couple things:
-The drive pot: i used a dual gang 100k instead of 1M, way easier to find, had to tailor a bit the values around the pot and scale them down following a 1:10 ratio;
?
-I omitted the send and spring reverb section, which uses a very particular 30k s-taper pot. I could have worked it around by using a linear pot and putting resistors in parallel in order to obtain that curve, but at the same time I wasn’t interested in having a spring reverb ( as i have already some nice digital reverbs in my effects chain );
Since I wanted it to be a bit more versatile I added a few things:
I felt it was essential to have a VCA at the out, as they are extremely useful and lovely.
Since I used 2 sections of a 2164 for the VCA and I still had 2 available, I decided to add a second vca on a feedback loop, this to test and see how much more tonal variation i could get. The nice thing about FB loops is that they create an oscillation, which can then be shaped on the EQ section of the circuit, and at certain settings when increasing the feedback amount you can clearly hear a sequence of tones harmonically related to each other.
I spent some time as well trying to find a way to get CV control over the EQ section, but without success.
For the panel I went for a classic chinese pattern.
Technical Specs
Shipping Details
How much is my shipping?
Shipping is automatically calculated before you submit your payment information. Simply add items to your cart and proceed to the checkout page, where you'll be offered shipping options and their prices. In the UK it's normally around £4 for order values under £150, and free above that. Shipping to mainland EU is typically between £7 and £20, depending on the shipping method and the size and weight of the order.
Do you ship to my country?
Almost certainly - the site will give you an estimate of shipping costs if you add an item to the cart and then enter your country and postcode. If you have specific requirements (such as if you prefer UPS over FedEx, for example) then let us know in advance and we'll try to work something out for you.
Shipping methods
We use a combination of Parcelforce, DPD, Royal Mail and UPS for the UK, and for international orders it's either Royal Mail, UPS, DHL or FedEx depending on where you are in the world. If you have a particular preference then try to let us know BEFORE you order so we can look into it for you. Please note that there may occasionally be additional shipping charges if you live in a remote area, depending on what surcharges are applied by the shipper. We'll get in touch to discuss this with you in such cases.
Dispatch times
For UK orders, we normally dispatch the same working day if we get the order before 15:00. If you have a really urgent situation then of course drop us an email before ordering and we'll always do our absolute best to accommodate you.
For international orders, we normally dispatch the same day if we get the order before 13:00 but again, occasionally it might be the next day before we can send it out, and sometimes FedEx or UPS may come a little earlier than scheduled which would also push an order into the next day.
Shipping times
Since April 2020 the couriers we use have suspended guarantees for shipping times, so even though we're paying them for priority services - 24-48 hours for most of the world - in practice it's often an extra day on top and sometimes it can be longer.
There is absolutely nothing we can do about this unfortunately. If you are outside the UK and it's a life-or-death situation where you absolutely MUST have that passive mult for the next day then... it may be better to find a local supplier.
Saturday shipping
If you're in the UK and you order before 15:30 on a Friday then we can send something for a Saturday delivery (NB: this applies to UK mainland addresses only). The success rate with DPD is about 95% so it's worth a punt most of the time. Please note that if you select Saturday shipping on an order placed earlier in the week, we'll wait until Friday to ship it.
Pre-orders
If a product is listed as a pre-order, it means we've ordered it from the supplier but it's not physically in stock yet. The product listing will include an estimated shipping date based on the best information we have from the supplier, but do bear in mind this is subject to change and is not a guaranteed date.
If you place an order containing a mixture of in-stock and pre-order items, we'll normally hold off on shipping anything until the pre-order item(s) have arrived, rather than splitting it into multiple shipments. If you need the in-stock items sooner, we'd recommend placing separate orders. As always, please get in touch if you have questions.
