As some of you may know, I dabble in electronics. I eventually sobered up and built the pedal, and I found—much to my surprise and delight—that it sounded great! Fast forward a few years. The tolex on the cabinet was dirty, loose and curling. The cabinet itself felt spongy in places, where the pine was rotted straight through. The chassis had a layer of patina and dust from years of neglect.
It’s been about 6 months since Part 1 of this series was printed so I thought it would be a good time to give an update on the Fender amp research that I am doing along with Devin Riebe and Greg Huntington. First I would like to thank everyone who responded to our request for data as outlined in the initial article that was printed in March issue of TCG. Most notably, I’d like to thank Jeff Lacio for his contributions to our research.
Jeff is an amp tech who specializes in Fender amps, i. Despite the heroic efforts by Jeff and other readers, we still need more data, so please keep it coming. In the meantime, we have discovered many fascinating factoids about Fender amps and we’ll probably learn a lot more as our research continues.
Fender | Bassman | Power Transformer Fender | Bassman, Twin | Output Transformer ’70s Silverface Bassman — 2, 4, 8 & 16Ω taps to our catalog – for the most up-to-date information, please email or call us:
Possible culprits include the preamp tubes, the power tubes, the hum balance resistors, and the power supply caps. Thanks for your input. I have a Deluxe Reverb and am trying to figure out if it has a Utah or some other kind of speaker. Any speaker ideas on that front? I also have one of the newer Fender Pro Reverb amps with an effects loop and a silverface Twin Reverb with a volume control.
Both amps produce very loud hum whether or not a guitar is plugged in. Could this just be bad caps? Or is there some other possible cause you can point me to? Most factory speakers in Fender amplifiers have what is known as an EIA code that specifies their manufacturer. The format may look like this:. Here the number designates the speaker as a Jensen, and indicates a production date of the 37th week of or Fender has used only a handful of different speaker types over the years.
This should help you identify your speaker.
Dating Fender Tube Amps By Serial Number
Fender Tube amp codes: – look for a 2 letter code stamped on the tube chart inside the back of the amp – the first letter is the year, and the second letter is the month. An amp stamped NA would have been made in Jan. Here is a list of the first letter showing the year of manufacture. These codes have nothing to do with the serial number that is stamped on the right rear of the chassis – Those numbers are posted below.
These codes are for amps with the serial number beginning with a letter:.
Up until the end of the blackface era (), all amps left the factory with a tube chart that had a two letter date code stamped on it. TUBE.
Some Fender amps have the two channels out of phase due to different number of tube stages in each channel, like the AA and AA Bassman and most AB reverb amps. Tolex is dating textured silverface material that covers the amp; offered in many different colors dating textures over dating years. Having a fixed bias means, contradictionary perhaps, that you need adjust the bias current or voltage by using a bias pot.
The dating charts dating sites in philadelphia not very useful for determining the circuit model. Long tail Script, says just Bassman, not Bassman I think the Bassman 50 had a separate cab with 2 x15 The bassmen 10 have four 32 ohm speaker and tat produces an 8. Thicker tone with more midrange emphasis silverface lends itself towards earlier breakup.
Several different types, silverface vertical and diagonal weaves, were used. There are other improvements to this circuit, that gave Silverface amplifiers a bad I would check the year these Bassman heads were manufactured.
Drip Edge Fender Amp Years of Production
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My Fender Bassman amp is for sale. Two channels with two inputs per channel. Channel 1 is labelled “Bass Instrument” and Channel 2 is labelled “Normal”, though you can use a bass just fine in both channels. Each channel has bass, middle and treble controls and there is a single master volume. Channel 2 has a “Bright” switch to make things brighter. Four big valves – it’s all valve.
Silverface Amp Modifications
Capacitor values have changed slightly over the years due to changing manufacturing standards. In some cases, 5uF has been replaced with 4. Many 20uF and 25uF have been replaced with 22uF.
Description About Us Free Jun 25, I just purchased an old fender bassman export silverface And I need some 1. How do I date this amp.
Unfollow fender twin silverface to stop getting updates on your eBay Feed. World’s leading marketplace. To assist us in better serving our customers, please take a minute to register your Fender products. Fender literally wrote the book on electric basses, laying the foundation for musical innovation and evolution. Learn more about Fender electric basses. You may also like Not only that, but to meet Swedish safety codes, Hagstrm removed the external voltage selector switch fitted to all blackface and silverface export models and hardwired it internally see photos.
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Fender Bassman 100, help with date and how to use headphones
Forgot your password? I got my old head out of storage to get repaired. I know it needs tubes, and most likely caps as well.
Bassman AB, AC, AA, AA (silverface) A to A – A to A – A to A – A to A –
The Code on the tube chart of your Fender Amp is made up of two letters. The First letter equates to the Year and the Second letter to the Month. Reissue amps also use stamped Date Codes. Examples of “Hand Stamped” Date Codes. The source-date code on a pot is a 6 or 7 digit code impressed into the casing of the potentiometer. For speakers this code can be 5, 6, 7 or 8 digits long, and it’s ink-stamped or paint-stamped on the “bell housing” of the speaker.
How to date vintage fender amps
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The tube charts are not very useful for determining the circuit model. At the Fender factory they used old tube charts when new models came, probably because the tube layout was the same. Determining production date by serial number and transformer codes is better, and you should also inspect the circuit to be completly sure. Amp collectors and idealists often prefer the pre-CBS models but if we study the AB circuit it does have something very interesting for guitar players who enjoy cranked Fender blackface tones.
The AA is very rare and its circuit and tone is quite similar to the AA We will further focus mostly on the AB vs AA The normal channel in the AA Bassman is cleaner than in the AB since it has no additional gain stage. We usually start with explaining a mod from a functional perspective where we relate to components in the logical schematics diagram. Finally we point out location of components in the physical layout diagram.