[sdiy] Tr-808 resistor value

[rburnett at richieburnett.co.uk]

Well I've since had an email off-list from a reputable source including 
photos of original TR-808 voice boards clearly showing 100k in that 
location.

And, that is more in line with what I had expected it to be.

-Richie,



On 2026-08-25 17:52, Todd Sines wrote:
> this is a bit confusing, I thought the consensus was that the resistor
> value of R324 was 100 K, now there is a post on the RE – 808
> Facebook group and it says it is 100 K
> 
> RE-808 [1]
> facebook.com [1]
> 
> FWIW, I’ve not tried to tackle this because I have a Roland TR-808,
> but I am trying to get it back up and running again because I removed
> the Kenton 808 mod that I added to it 31 years ago.
> 
> Todd
> 
>> On Aug 22, 2026, at 2:17 PM, Richie Burnett
>> <rburnett at richieburnett.co.uk> wrote:
> 
>> Well that seems like a consensus that it's 220k.  Thanks to all
>> those who replied.
>> 
>> The 220k value just seemed a little odd to me at first...  Given
>> that this matches the value of R319 in the Claves voice output, it
>> would seem like they could have just used a single 220k resistor
>> after the voice selection changeover switch.  Essentially in series
>> with C125 and R326, or even combined with R326 to save the cost of
>> one (or two) resistors.
>> 
>> I know that the value of R324 mostly just alters the volume of the
>> Rimshot sound relative to the others, but it also alters the cut-off
>> frequency of a high-pass filter formed in combination with R326 and
>> C125.  This is the reason why I wanted to know the correct value.
>> 
>> I'll go with 220k in the absence of any evidence to the contrary!
>> 
>> -Richie,
>> 
>> -----Original Message----- From: Chromatest J. Pantsmaker via
>> Synth-diy
>> Sent: Saturday, August 8, 2026 10:01 PM
>> To: synth-diy at synth-diy.org
>> Cc: rburnett at richieburnett.co.uk
>> Subject: Re: [sdiy] Tr-808 resistor value
>> 
>> It makes sense that it would be the same as R319, which is 220K.
>> 
>> -------- Original Message --------
>> On Saturday, 08/08/26 at 13:04 Todd Sines via Synth-diy
>> <synth-diy at synth-diy.org> wrote:
>> 
>> The RE-808 is supposed to be a 1:1 clone, it also is 220k. Sorry for
>> not opening mine up but pretty certain that is it.
>> 
>> Todd
>> 
>>> On Aug 8, 2026, at 3:55 PM, Pete Hartman via Synth-diy
>>> <synth-diy at synth-diy.org> wrote:
>> 
>>> 
>> 
>>> The Yocto is an 808 clone of sorts, it has that resistor marked
>>> as 220K
>> 
>>> 
>> 
>>> Can't speak for the OG.
>> 
>>> 
>> 
>>> Pete
>> 
>>> 
>> On Sat, Aug 8, 2026 at 2:34 PM <rburnett at richieburnett.co.uk>
>> wrote:
> 
>>> 
> 
>>> Does anyone know the value of R324 in the Rimshot voicing circuit
>>> of
> 
>>> Roland's TR-808 drum machine?
> 
>>> 
> 
>>> Seemed like a good day to ask ;-)
> 
>>> 
> 
>>> -Richie,
> 
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>> 
> 
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