S.I.R. 100W SuperLead Schematic pt. II

BRMSlash · Post by **BRMSlash** » Wed Jul 13, 2016 4:58 pm

sonoman1979 wrote:Hi, can someone tell what would be the difference between replacing first coupling cap only with 2.2n (the other ones are 22n) and third coupling cap only with 2.2n. Thanks.

I guess it depends on what spec you're using, but in my spec, 2.2n thins out the tone too much in either position. I have found that the 2nd coupling cap can be lowered with reasonable success to between 5n and 10n.

sonoman1979 · Post by **sonoman1979** » Thu Jul 14, 2016 1:29 am

BRMSlash wrote:
sonoman1979 wrote:Hi, can someone tell what would be the difference between replacing first coupling cap only with 2.2n (the other ones are 22n) and third coupling cap only with 2.2n. Thanks.
I guess it depends on what spec you're using, but in my spec, 2.2n thins out the tone too much in either position. I have found that the 2nd coupling cap can be lowered with reasonable success to between 5n and 10n.

Thanks for sharing that BRMSlash, I recently try 2.2n on first stage and it was too thin and also seems like there was not enough gain on the low and mid freqs, I was wondering if using 2.2 on third could alow more saturation but also reduce some of the lows. Thanks for your advice

dukeamps · Post by **dukeamps** » Thu Jul 14, 2016 10:22 am

BRMSlash wrote:Hey Duke, that last SCOM clip is very nice.

Also just wondering, what type of cathode bypass caps and cathode resistors are you using? I've recently tried some Kemet R82's 100v stacked film caps for the 2nd & 3rd stages that sound pretty good. Also stuck some in my guitar.

Cheers BRMSlash

In this amp i have used Mullard mustard caps & Carbon film resistors, tubes are, V1 JJ, V2,3,4, Nos Chinese, & RFT el34s.

I have also had great results with Mallory caps.

BRMSlash · Post by **BRMSlash** » Fri Jul 15, 2016 5:20 am

Gessinger · Post by **Gessinger** » Fri Jul 15, 2016 8:49 am

Guys, I built a JCM800 2204 clone, with mod # 34 and # 36 installed, according to the specs Dukeamps. The tone is very good, but the mod # 36 has little gain with master volume below 8. Even with preamp 8, master volume 6, for example, generates little gain. In the mod # 34 the gain is great. Does anyone know if this is normal? Or you can change something in the project? How does the amp of you?

reychapa · Post by **reychapa** » Fri Jul 15, 2016 11:53 am

We should see how this installed everything, in my case, I have the mod # 34 and # 36, and I have gain for long time...

Gessinger · Post by **Gessinger** » Fri Jul 15, 2016 1:22 pm

reychapa wrote:We should see how this installed everything, in my case, I have the mod # 34 and # 36, and I have gain for long time...

I can provide the schematic here, but belongs to the dukeamps, he posted some time ago ... you can share your schematic to # 34 and # 36

http://www.mediafire.com/view/tx2z1g7dy ... 436mod.jpg

reychapa · Post by **reychapa** » Fri Jul 15, 2016 1:39 pm

I have understood that the mod # 36 has an extra stage, another 12AX7. With respect to Switch between choosing or not the cap 100n, would be the mod # 34 or stock. If you are looking to have more gain, change the resistance of 2k7/680n by 1k2/1uF (2nd stage)

Gessinger · Post by **Gessinger** » Fri Jul 15, 2016 6:01 pm

reychapa wrote:I have understood that the mod # 36 has an extra stage, another 12AX7. With respect to Switch between choosing or not the cap 100n, would be the mod # 34 or stock. If you are looking to have more gain, change the resistance of 2k7/680n by 1k2/1uF (2nd stage)

Thanks for the tips, I'll try ... you could please post your schematic to # 34 and # 36 or send via emial?

reychapa · Post by **reychapa** » Fri Jul 15, 2016 6:52 pm

Gessinger wrote:Thanks for the tips, I'll try ... you could please post your schematic to # 34 and # 36 or send via emial?

probably a specification that approaches the sound AFD , but this configuration is the one I liked personally ..

BRMSlash · Post by **BRMSlash** » Fri Jul 15, 2016 10:04 pm

I've been trying to tighten up the treble and bass. This clip below has a 0.47u MKT368 1st stage cathode, 0.1u r82 2nd & 3rd stages and 0.47u mkt368 4th. Also put the Kemet r82's into my guitar for the tone caps.

http://sclk.co/s7zk4o

herbvis · Post by **herbvis** » Sat Jul 16, 2016 1:53 am

Interesting idea for the hiss reduction. Does it work well without altering the tone?

reychapa · Post by **reychapa** » Sat Jul 16, 2016 6:46 am

No altering the tone, I think there is a video in the web..

BRMSlash · Post by **BRMSlash** » Mon Jul 25, 2016 2:38 am

Increased the preamp B+ filter caps to tighten up the bass.
http://sclk.co/s7znx5

dukeamps · Post by **dukeamps** » Tue Jul 26, 2016 5:03 am

BRMSlash wrote:Increased the preamp B+ filter caps to tighten up the bass.
http://sclk.co/s7znx5

If you ever get the chance you could try these speakers, also try and get the old ones.

https://www.google.de/search?q=marshall ... 12+speaker

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S.I.R. 100W SuperLead Schematic pt. II

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