The Steel Guitar Forum

The last time I had a JBL D120F re-coned by authorized JBL service center, I was informed the only JBL kits available were the "E" series. Price for 120 and 130 speakers was around $279 each. The places that re-cone JBL speakers for $100 are using after market kits. My experience is if it ...

Save your money and go for the 67 cent cap. $20 for a capacitor? I can't justify that!

Les Paul Gibsons use 0.047 ufd for tone according to Gibson Guitar website.

I have to agree with Will Cowell. A vacuum tube is a linear amplifying device. It reproduces what is applied. I've never heard of tubes having scooped mid-range. A scooped sound is a result of components. I've been playing for 55 years and have never heard anything described by Tim Marcus, but that ...

I have an Evans AE-100 I bought from John Hughy. After experiencing intermittent distortion, I found coupling cap on reverb board was broken at the board. Was able to solder a new lead on cap and re-connect it to board. Amp is now rock solid. I use it with 12 in. Altec Lansing ext. speaker. I'm happ...

I believe the model should be SE120.

Lysol spray will usually kill odors and the bacteria that causes the odor.

Easiest check is replace rectifier, then check B+ voltages. If it still blows fuse, a shorted tube, capacitor or OT COULD be problem. Remove all tubes except 5AR4. If it still blows fuse, I suspect a shorted filter cap although it could be something else.

Instead of buying a high price piece of equipment, I have used the following method to check bias setting for Fender Twin Reverb. Buy precision one ohm one watt resistors and solder them between the cathode and ground in each of the 6l6GC tube circuits. The reading you get when measuring the voltage...

I have a Boss Tremolo TR-2 I bought new, never used. $60 shipped. Emil me if interested.
Larry

I play my Gretsch 6120 through an Evans AE100 with external JBL G125 speaker. I have had no problem getting the sound I had when I used a Twin Reverb w/JBL speakers. If I was in the market for a new amp, I would get the Evans RE200. There is a forum member who doesn't like Evans and has posted his d...

One main difference between silicon and germanium transistors is: The emitter base voltage for germanium is approx. 0.2VDC and the emitter base voltage for silicon is 0.7VDC. If you sub a silicon transistor for a germanium transistor, you need to re-design the circuit. Biasing will change. I don't b...

The flux density is different for Neo, Alnico, and Ceramic magnets used in speakers. There is no simple answer to your question, in my opinion. There is a lot of information on the link posted by Rick.

I have an AE100 I bought from John Hughey in 2005. I had a problem with intermittent distortion. I found a broken wire on the component (coupling cap to reverb board). I was able to repair it and it's been solid since. Scot Buffington referred me to a repair facility in Texas. However, I didn't use ...

Mouser Electronics has the chips. You can look at their catalog for prices. I would replace those 4558's with the 2134 chips. I replace the 4558 chips in my Bandit 65 with the OPA2134' with no problems.

I would buy one tube made by the same mfg. as the other
el84's. Check that it isn't glowing cherry red after you plug in the new tube. If it sounded good before you broke the tube, it will probably sound good after replacement. I wouldn't replace all tubes just because I broke one.

Visit the following site: http://lansingheritage.org/. I found photo's of the D-131 in the Lansing catalogs and they all had aluminum dust covers. I suspect someone had it re-coned by someone other than JBL service center. Factory JBL re-cones cost around $275. I would look for used D,K,E 120 speake...

I believe input 2 is attenuated 6db which accounts for th different levels.

If the static current is 18ma then something is definitely wrong. Static current should be around 35-38 ma for each tube. Are you sure you measured the values correctly? I personally would not hack this amp. Just make sure the components and voltages are in tolerance. I make my recommendations based...

I have a copy of an old op instructions for Evans Amp which reads: Expand boosts lows and highs. Depth--Boosts lows and low mids; cuts some of the highs. Note: When using this control, you may need to turn BODY down to 4-6 and boost treble. One suggested Settings for steel: Depth-off. Expand-On. Bas...

The Digitech Hardwire DL-8 has modulated delay I think is quite good. This pedal is quiet and has other features as well.

David, the value of the cap should be 22 mfd, not 0.22. It's sole purpose is to keep the bias voltage constant.

The resistor is there to provide bias for the tube(called cathode self bias). The cap (cathode bypass cap) keeps the voltage constant across the resistor. if you remove the cap, degeneration is introduced which lowers the tube gain and improve fidelity. if you remove the resistor, then there is no b...

I have a custom built open back speaker cab. I presently have EVM-12S installed in it. I'll sell the cab for $140 + shipping cost. Photo on request.
Larry Robinson

I have a JBL E-120 8 ohm speaker mounted in a Marrs cabinet. Cost is $275 + shipping cost. Email me for photos if interested.