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Full Retube™ Kits for Marshall 900 Series 100 Watt Amps.  
Description: Full Retube Kits for Marshall 900 Series 100 Watt Amps. Some of these amps came with EL34's in which case you can use E34L's and KT77's but using 6L6GC's may require that the final bias resistor be changed to be able to dial in the bias. Some models came with 5881's so you can use 6L6GC's or hotter grades of E34L's and KT77's with no mods, only a bias adjustment. Leave us a note in the comments box on the checkout page telling us what you have.

Marshall 900 100 Watt Standard Retube with E34L's
Price: $98.00 
Description: A matched quad of the JJ E34L's for a deeper and tighter low end and a very warm and punchy tone. Two standard ECC83S's for V1 and V2 along with a current balanced ECC83S for V3 which is the phase inverter.
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Marshall 900 100 Watt High Gain Retube with E34L's
Price: $110.50 
Description: Need maximum gain? This kit uses a matched quad of the JJ E34L's for a deeper and tighter low end and a very warm and punchy tone. Two hand picked high gain ECC83S's for V1 and V2 along with a high gain current balanced ECC83S for V3 which is the phase inverter.
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Marshall 900 100 Watt E34L ECC803S V1 Option
Price: $102.25 
Description: This kit uses a matched quad of the JJ E34L's for power with one standard ECC803S for V1 for a little more of a vintage tone with thick mids and a little more high end. One standard ECC83S for V2 along with a current balanced ECC83S for V3 which is the phase inverter.
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Marshall 900 100 Watt Gold Pin Option With E34L's
Price: $129.00 
Description: Need a smoother tone? This kit uses a matched quad of the JJ E34L's for power and three Gold pin ECC83S's with one of them balanced for the phase inverter in V3. If you like a bit of grit in your tone then stay with the standard preamp tubes but if smooth is what you want, the Gold pin tubes deliver.
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Marshall 900 100 Watt ECC803S Gold Pin Option With E34L's
Price: $137.50 
Description: Want to go beyond smooth? This kit uses a quad of the E34L's for power and what we call the "Ultimate Smooth" front end which uses a Gold pin ECC803S for V1, a Gold pin ECC83S in V2 and a balanced Gold pin ECC803S in V3 for the phase inverter. This is as smooth and rich as it gets!
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Marshall 900 100 Watt Standard Retube with KT77's
Price: $114.00 
Description: Want to keep that EL34 type tone but you need more low end chunk? Then the KT77's will get you there. This kit uses a matched quad of the JJ KT77's for a chunky thick low end and a very rich tone. Two standard ECC83S's for V1 and V2 along with a current balanced ECC83S for V3 which is the phase inverter.
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Marshall 900 100 Watt High Gain Retube with KT77's
Price: $126.50 
Description: Need maximum gain but you want the low end chunk that the KT77's have? This kit uses a matched quad of the JJ KT77's for power. Two hand picked high gain ECC83S's for V1 and V2 along with a high gain current balanced ECC83S for V3 which is the phase inverter.
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Marshall 900 100 Watt KT77 ECC803S V1 Option
Price: $118.25 
Description: This kit uses a matched quad of the JJ KT77's for power with one standard ECC803S for V1 for a little more of a vintage tone with thick mids and a little more high end. One standard ECC83S for V2 along with a current balanced ECC83S for V3 which is the phase inverter.
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Marshall 900 100 Watt Gold Pin Option With KT77's
Price: $145.00 
Description: Need a smoother tone with the KT77 sound? This kit uses a matched quad of the JJ KT77's for power and three Gold pin ECC83S's with one of them balanced for the phase inverter in V3. If you like a bit of grit in your tone then stay with the standard preamp tubes but if smooth is what you want, the Gold pin tubes deliver.
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Marshall 900 100 Watt ECC803S Gold Pin Option With KT77's
Price: $153.50 
Description: Want the KT77 sound and the smoothest richest sound possible? This kit uses a quad of the KT77's for power and what we call the "Ultimate Smooth" front end which uses a Gold pin ECC803S for V1, a Gold pin ECC83S in V2 and a balanced Gold pin ECC803S in V3 for the phase inverter. This is as smooth and rich as it gets!
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Marshall 900 100 Watt Standard Retube with 6L6GC's
Price: $112.00 
Description: A matched quad of the JJ 6L6GC's which will get the biggest low end from a 900 along with two standard ECC83S's for V1 and V2 and a current balanced ECC83S for V3 which is the phase inverter.
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Marshall 900 100 Watt High Gain Retube with 6L6GC's
Price: $124.50 
Description: Need maximum gain but you want the huge 6L6GC low end? This kit uses a matched quad of the JJ 6L6GC's for a deeper and tighter low end and a very warm and punchy tone. Two hand picked high gain ECC83S's for V1 and V2 along with a high gain current balanced ECC83S for V3 which is the phase inverter. This kit is also a great way to go if you scoop your mids.
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Marshall 900 100 Watt 6L6GC ECC803S V1 Option
Price: $116.25 
Description: This kit uses a matched quad of the JJ 6L6GC's for power with one standard ECC803S for V1 for a little more of a vintage tone with thick mids and a little more high end. One standard ECC83S for V2 along with a current balanced ECC83S for V3 which is the phase inverter.
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Marshall 900 100 Watt Gold Pin Option With 6L6GC's
Price: $143.00 
Description: Need a smoother tone along with the fat 6L6GC's? This kit uses a matched quad of the JJ 6L6GC's for power and three Gold pin ECC83S's with one of them balanced for the phase inverter in V3. If you like a bit of grit in your tone then stay with the standard preamp tubes but if smooth is what you want, the Gold pin tubes deliver.
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Marshall 900 100 Watt ECC803S Gold Pin Option With 6L6GC's
Price: $151.50 
Description: Want the 6L6GC sound and the smoothest richest sound possible? This kit uses a quad of the 6L6GC's for power and what we call the "Ultimate Smooth" front end which uses a Gold pin ECC803S for V1, a Gold pin ECC83S in V2 and a balanced Gold pin ECC803S in V3 for the phase inverter. This is as smooth and rich as it gets!
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