Analogman - King of Tone, Mystery "H" IC

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
Post Reply
User avatar
nimrodthebomber
Information
Posts: 5
Joined: 04 Nov 2016, 08:27
Been thanked: 6 times

Post by nimrodthebomber »

Out of curiosity I decided to strip off the "H" marking on my Analogman KOT 2012 version. Using a bottle of acetone nail polish. Hope this helps,

IC is nothing but 4580D (top marking is 4580D JRC B011B, bottom factory marking is "68h")

Enjoy! Still one of my favorite overdrive ever. :)

Hope everyone is safe and sound during this covid-19 pandemic.
IMG_20200505_204523.jpg
Attachments
IMG_20200317_235045.jpg
IMG_20200317_234249.jpg
IMG_20200317_234717.jpg
49859117736_313a12aaf1_o.jpg
49859429427_2342ce65c3_o.jpg
49859116421_5d0f988a8e_o.jpg
Last edited by nimrodthebomber on 01 Jun 2020, 04:58, edited 2 times in total.

User avatar
Cigla tel.
Information
Posts: 18
Joined: 06 Apr 2016, 13:34
Has thanked: 4 times
Been thanked: 4 times

Post by Cigla tel. »

Tnx for the info. Btw. that 4 clipping diodes "D8, D7, D11, D10", are not the rare ones 1S1588?!?
Can you read the inscription on them? They may just be ordinary 1n914 or even 1n4148?!?

User avatar
nimrodthebomber
Information
Posts: 5
Joined: 04 Nov 2016, 08:27
Been thanked: 6 times

Post by nimrodthebomber »

Cigla tel. wrote:Tnx for the info. Btw. that 4 clipping diodes "D8, D7, D11, D10", are not the rare ones 1S1588?!?
Can you read the inscription on them? They may just be ordinary 1n914 or even 1n4148?!?
The four yellow diodes i believe are ma856 diodes. Yes markings on the other four are just 1N4148s

User avatar
Cigla tel.
Information
Posts: 18
Joined: 06 Apr 2016, 13:34
Has thanked: 4 times
Been thanked: 4 times

Post by Cigla tel. »

nimrodthebomber wrote:The four yellow diodes i believe are ma856 diodes. Yes markings on the other four are just 1N4148s
Thanks, I assumed those diodes were in question!

User avatar
batteryacidtea
Breadboard Brother
Information
Posts: 104
Joined: 18 Feb 2009, 03:42
Has thanked: 57 times
Been thanked: 18 times

Post by batteryacidtea »

very ingenious indeed, hahahaha

User avatar
oooscasianooo
Information
Posts: 7
Joined: 17 Sep 2013, 04:35

Post by oooscasianooo »

Wow, not even a "DD"? Interesting...

You can raise the gain of a Bluesbreaker style pedal by:

Increasing Drive pot from 100k to 250k (or higher)
Increasing the 220k (R7 in the KOT) "gain resistor" for the 2nd half of dual opamp
Decreasing the 10k (R6 in KOT, his POT "turbo" mode lowers this to 1k I believe), but not much gain increase, maybe just a bit more saturation.

Can you confirm if the high gain side has any of these modifications?

User avatar
nimrodthebomber
Information
Posts: 5
Joined: 04 Nov 2016, 08:27
Been thanked: 6 times

Post by nimrodthebomber »

oooscasianooo wrote: 07 May 2020, 17:07 Wow, not even a "DD"? Interesting...

You can raise the gain of a Bluesbreaker style pedal by:

Increasing Drive pot from 100k to 250k (or higher)
Increasing the 220k (R7 in the KOT) "gain resistor" for the 2nd half of dual opamp
Decreasing the 10k (R6 in KOT, his POT "turbo" mode lowers this to 1k I believe), but not much gain increase, maybe just a bit more saturation.

Can you confirm if the high gain side has any of these modifications?

Sure man. I'll try to ID the components. Resistors color coding and multimeter resistance as well. I'll do the same thing with all the components as well.

User avatar
nimrodthebomber
Information
Posts: 5
Joined: 04 Nov 2016, 08:27
Been thanked: 6 times

Post by nimrodthebomber »

oooscasianooo wrote: 07 May 2020, 17:07 Wow, not even a "DD"? Interesting...

You can raise the gain of a Bluesbreaker style pedal by:

Increasing Drive pot from 100k to 250k (or higher)
Increasing the 220k (R7 in the KOT) "gain resistor" for the 2nd half of dual opamp
Decreasing the 10k (R6 in KOT, his POT "turbo" mode lowers this to 1k I believe), but not much gain increase, maybe just a bit more saturation.

Can you confirm if the high gain side has any of these modifications?
Check out the new pics as well. The orginal didnt really used a higher pot for the drive gain. For sure mods on the pcb board. I'll check it out soon on my kot.

User avatar
Bolsyo
Information
Posts: 26
Joined: 27 Jun 2019, 21:44
Has thanked: 41 times
Been thanked: 34 times

Post by Bolsyo »

@nimrodthebomber could you post some pictures of the resistors going into the drive pots? I believe it's R16 on the high-gain side, R17 on low-gain side. There was a gutshot in the Facebook group where this resistor has clearly been painted a red band (stock 1k) over a yellow band (100k) on the high gain side, would be interesting to see if it's the same in your pedal. Keep an eye out for any other resistor bands that look painted. Would also like to see the yellow feedback loop caps next to the ICs. :)
Image
Image

User avatar
Nocentelli
Tube Twister
Information
Posts: 2222
Joined: 09 Apr 2009, 07:06
Location: Leeds, UK
Has thanked: 1152 times
Been thanked: 954 times

Post by Nocentelli »

Bolsyo wrote: 04 Jun 2020, 14:49 this resistor has clearly been painted a red band (stock 1k) over a yellow band (100k) on the high gain side, would be interesting to see if it's the same in your pedal. Keep an eye out for any other resistor bands that look painted.
Image
Sad
modman wrote: Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...

User avatar
Whoismarykelly
Resistor Ronker
Information
Posts: 395
Joined: 22 Oct 2007, 18:26
Has thanked: 6 times
Been thanked: 17 times

Post by Whoismarykelly »

A long time ago someone on DIY stomps suggested repainting resistors to change apparent values as a diabolical way to throw off would-be cloners working from photos. Interesting to see analogman actually did it.

User avatar
soulsonic
Old Solderhand
Information
Posts: 3880
Joined: 27 Jun 2007, 03:38
my favorite amplifier: Traynor YVM-1
Completed builds: too many!
Location: Morgantown, WV
Has thanked: 183 times
Been thanked: 468 times
Contact:

Post by soulsonic »

Whoismarykelly wrote: 14 Jun 2020, 16:42 A long time ago someone on DIY stomps suggested repainting resistors to change apparent values as a diabolical way to throw off would-be cloners working from photos. Interesting to see analogman actually did it.
It was done in the Lastgasp Super Oscillo Fuzz I traced a long time ago as well.
"Analog electronics in music is dead. Analog effects pedal design is a dead art." - Fran

User avatar
PRCUSTOMFX
Information
Posts: 2
Joined: 24 Jul 2018, 15:28
Has thanked: 3 times

Post by PRCUSTOMFX »

Good night, what will be this key between the two units?

Post Reply