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  1. Gordon Rankin

    Can you DIY tube burn in ?

    I am working on my 1212 amp right now. Do tubes change over the first 40 to 80 hours? Yes, but usually the same amount if they come from the same batch. Most amps that I have fixed for friends (i.e. not my amps).... run the tubes pretty hot, like on the edge and higher than suggested points. I...
  2. Gordon Rankin

    UK vs US voicings and a speaker journey (V30, GB, H30, Alnicos, DV77, T75s...) (LONG AND RAMBLING)

    HFloyd, Sealed cabinets have one disadvantage and that is that with a driver inside the Fs or the resonant point of the speaker in the cabinet will cause a huge hump in impedance as seen by the amplifier. Different amps and speakers will react differently and therefore I always caution my...
  3. Gordon Rankin

    Channel Foot Switch interface on my DLS1H kills output

    All, Day 4 a friend sent me the schematics and it looks like I have a couple of iffy solder joints. Why do I say that? Well the OD channel is working all the time now. But the clean channel seems to die at the VOL control..... and now when I plug it in the back... now everything is working. Oh...
  4. Gordon Rankin

    Channel Foot Switch interface on my DLS1H kills output

    Day 3 Ok this happens before the FX loop. Unlike the schematic I have for some other 1W unit, this one uses an MPSA42 as the emitter follower to send to the FX loop instead of 1/2 of the 12AU7/ECC82. The weird thing is neither of the relays that should feed this thing are anywhere near the...
  5. Gordon Rankin

    Channel Foot Switch interface on my DLS1H kills output

    Ok so it appears there are 2 relays both DPDT, and here is the switching that seems to be the same as this one from a different schematic. Ok so Relay 2, in the clean mode bypasses the overdrive and mutes the overdrive circuit. Relay 1 in clean mode enacts a -12dB gain. So basically in overdrive...
  6. Gordon Rankin

    Channel Foot Switch interface on my DLS1H kills output

    Ok no micro, only switching relay. I can't see any diode bleed on this thing. Will check if the damn relay is just dead. I do always have this problem if the external switch is plugged in which disables the front switch so maybe adding a diode will fix this. I have used a bunch of relays that...
  7. Gordon Rankin

    Channel Foot Switch interface on my DLS1H kills output

    Ok you may have a point about the mute as it's now stuck in mute without the foot switch or trying to change the channel via the FP. I will pull the amp out and check and see what the problem is. Those micro's work at any voltage from 2.5->5.5V and they are pretty tolerant. I would imagine the...
  8. Gordon Rankin

    Channel Foot Switch interface on my DLS1H kills output

    Thanks, and you are correct with your assumption. No loose connections and I guess I can look at the microcontroller. I do some programming and while I use Microchip PIC controllers I do have an FAE that might be able to help me out if that is the problem. But really the micro is just going to...
  9. Gordon Rankin

    Will the DSL1h with an mx2x12 or mx4x12 do for me?

    Greg, Also a drummer since I was 12, been playing guitar for the last 20 years started when I was asked to build a guitar amp for a friend. I have the DSL1H dual channel and have it plugged into a 1x12 15ohm Celestion Blue right now. First problem is it's a bit noisey compared to some of my...
  10. Gordon Rankin

    Channel Foot Switch interface on my DLS1H kills output

    All, So I have been fighting what I thought was a tube or amp problem for a couple of days. I have the 50th anniversary issue DSL1 with dual channels. I pulled the tubes and replaced one at a time no go no output. So I pulled the amp out put it on my bench and it worked fine??? So then I put it...

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