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B52 AT100 ECC803S V1 Option

Our Products: Full Retube™ kits for Guitar Amps > Retube™ Kits For B52 > B52 AT100

Price: $283.50

B52 AT100 ECC803S V1 Option

Product Details

Looking for a more vintage tone with fat mids and a real sparkle? This is the ECC803S V1 Option Retube Kit for the B52 AT100. The preamp section uses one ECC81 to replace the 12AT7, a Long Plate ECC803S for V1 for a little lower gain with big thick mids and a little more sparkle in the highs, and five ECC83S's with one balanced for the phase inverter in V5. The power section uses a GZ34 Rectifier tube and the default power tubes are a matched quad of the JJ 6L6GC’s but you can configure this kit to use the JJ 5881’s by clicking on the "Customize" button!

Note: The JJ 5881's are a 23 watt tube and the B52 AT100's when run in the class "A" mode run 6L6's very hot, so the 5881's would be running VERY hot. For this reason we recommend running the 5881's in the A/B mode and biasing at 70% based on 23 watts.

The ECC81 is located in V10 which is actually the fifth preamp tube away from the input jack. The ECC803S is located in V1 which is the closest preamp tube to the input jack. The Balanced ECC83S is located in V5 which is actually the seventh or last preamp tube farthest from the input jack.

These are all adjustable bias amps and all you need to check and adjust the bias is a Multimeter if you're using the B52 method. A more accurate method is to use a bias probe and a Multimeter, or our all-in-one Eurotubes "Pro One" bias probe that reads both the plate current and the plate voltage simultaneously. These are available under the "Related Products" tab.

Note: The JJ 5881's are a 23 watt tube and the B52 AT100's when run in the class "A" mode run 6L6's very hot, so the 5881's would be running VERY hot. For this reason we recommend running the 5881's in the A/B mode and biasing at 70% based on 23 watts.

You can use our Generic bias video for reference which we did on a Marshall 800 and the procedure is the same.

The video below explains the difference between bias probe types.

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