Category Archives: Amps

Hiwatt DR103 : crunch mode mod !

Here is an Hiwatt DR103 a customer wanted to be modded « a la Jimmy Page ». I proposed a slightly more easy and reversible mod … So, here we go !

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Marshall JCM900 2100SLX less bright mod

As many Marshall, the JCM900 2100SLX sounds VERY bright, outch ! So, I removed the 1nF bright cap (called …R22 !!!) and that is how it sounds now : Easy mod, you can even cut one leg of R22 ! … Continue reading

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Carslbro 50 TOP

I got this Carslbro 50 TOP to fix (burnt OT). OT : Drake 784-213 (4.4k Zaa) Schematic (thanks Chambonino !)   The point is : on « my » 50 Top, power supply is quite different : PT has a central tap … Continue reading

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Stramp 2100A

As used by Rory Gallagher and Leslie West … Actually, even if Rory played on Stramp amps, I’m not sure he used this model … Huge capacitors and transformers … ‘70s PCB, that can be accessed from inside and outside … Continue reading

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Vampower

      (thanks to http://www.chambonino.com) See http://www.vampower.com for more information  

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Miles Platting amp

I got this amp for a complete check-up. 50W, 3 x 12AX7, 2xEL34, 1 GZ34 End of ‘60s, beginning of ‘70s I think …    Miles Platting amps were made by Wilsic   Here is a Wilsic 50W (picture from … Continue reading

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Fender Bassman Silverface circa 1967

A nice Bassman to check : From top to bottom : Bassman ’67,Bandmaster ’68, Bassman 100 ‘75   bassman_ab165_layout Earth OK, no Deathcap : good !   AB165 schematic   DripEdge, blacklines, Schumacher (606) transformers and choke from 1966 and … Continue reading

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Blackstar HT5 bad sound

I got this nice little amp to fix. It fizzed. I checked the tube : OK … then I saw R39 resistor was burnt. I spiced the FET PI, replaced the burnt resistor and compare voltage : good !   … Continue reading

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IT-11 Audio British Blues Amp

Based on a very classic and well known 18W, with a tube booster …      

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‘70s Fender Twin Reverb

A nice Fender Twin Reverb from 1976. Master volume, export version. 100W_Mast_Vol_SF_Twin_Rev_Schematic BW_Layout_Twin_Reverb 40 years old caps, I prefer to replace them … Export version … The voltage selector is dead : I replace it with a new one from … Continue reading

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