Peavey Bravo Mods?

Discussion in 'Other Amps' started by RickyLee, Sep 26, 2010.

  1. RickyLee

    RickyLee Well-Known Member VIP Member

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    Anyone here an expert on the Peavey's? I am looking for some mods for the Bravo to give it a bit more clarity. I am already running it through a nice closed back 2X12, so there is no speaker issues. I have decent tubes in it as well. And I am getting ready to possibly mod it to an adjustable bias. I am thinking about installing a Standby switch as well.

    But the main issue I am having with this little beast, is it does not take boost pedals up front too well. The signal gets overloaded very easy when you hit the front with anything hot including a clean signal boost pedal.

    Besides the latency/delay in the channel switching, these little amps are quite cool.

    So some clarity mods or even tone stack mods would be appreciated.
     
  2. clutch71

    clutch71 Well-Known Member

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    I'd try asking around on the Peavey Forum. If memory serves though only a couple of guys have modified them. I do have a schematic if you need it.

    I have used OD's with them even though I feel they do not need it (post 5 with gain pulled out and pre on 5 good to go through a 4x12) 808 RI and TS-9. Neither pedal did what you described. Remember too that it's an active EQ. The pot your turning will effect the previous pot.

    Were you aware there is an issue with the loop on those things? Plug a patch cable into the send and return and see if that helps. It's also easy to overlook cleaning the input jacks and loop jacks....

    Something just sounds off based on what your describing and I know from previous posts(and forums for that matter) that your no stranger to the guts of an amp.

    Really curious to hear your thoughts on the amp....
     
  3. RickyLee

    RickyLee Well-Known Member VIP Member

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    Thanks for the reply. Yeah, we have been over quite a few different topics at the other Forum.

    :cheers:


    Hmmm, as for the FX loop on this thing? I did not know there was an issue with it. Would you know off hand what the issue is? I have ran my delay through the loop and it seemd to be OK.

    I actually have it sounding a bit better after I figured out the strange voltage drop I was getting on the plate of the EL84 V5. Did you see my post in the Workbench section on that?

    http://www.marshallforum.com/workbench/18868-low-plate-voltage-half-output-xfmr-primary.html


    I have not found much info on these amps on the net in regards to modding them and improving the tone. I know the tonestack is active. I did see a few old posts from a different forum that had info from a member here, Joey Voltage. (Joey, you out there??!!??)

    Joey Voltage and another fella there were the very knowledgeable guys on that forum regarding Peaveys among other things. I was gonna P.M. Joey here, but he is quite busy now and taking a break from the forum.

    Yeah, one of the reasons there's probably not much modding info on these, is due to them being such a pain in the Arse to work on. Everything is crammed quite tight in there and to pull the main PCB out looks to be a pain. I get concerned about those ribbon connectors and causing interemittent problems with solder joints and such when messing with these type of amps. Unless it is broken, I do not really like to pull the PCB's out.

    I did re-work the bias circuit in this Bravo to an adjustable dual independent circuit for each EL84 though. It will allow me to run all these odd mismatched EL84's I have on hand.
     
    Last edited: Oct 8, 2010
  4. cudamax2343

    cudamax2343 New Member

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    Here is something I found on the Internet

    Product: Peavey Bravo 112
    Price Paid: UNKNOWN
    Submitted 03/10/2009 at 04:27pm by kahelle hife
    Email: kahelle_hife13 at hotmail<dot>com

    Features : No Opinion

    Sound Quality : No Opinion

    Reliability : No Opinion

    Customer Support : No Opinion

    Overall Rating : No Opinion
    somewhat somehow HC refuse to let me write review. so here goes-----..
    this is my second bravo. a 1990 grey tolexed bravo 112 with all original including tubes.

    wasnt cheap like the previous black iv bought but was worth it.

    as usually, i changed the tubes to JJs, did my footswitch mod and put in a standby switch.
    ok, it wasnt me but it was there that the previous owner installed and that got the original tubes when he bought the amp 2 years ago.
    so basically, he had the amp stock and changed the tubes and added the standby switch.

    i also changed the original reverb tank as the tank was caput, gave too low signal, changed to a laney VC-30 tank. it was better effect. also shielded the tank with aluminuim foil underneath and pack it with a black bag and screwed it down.

    comparing to the balck amp i got for like 2-3 years ago (cant remember) is that my black amp is somewhat brighter clearer more hifi sounding and not as dark and bassy as this grey one.

    why? its coz iv changed all big/small electrolitic caps on the black amp along with the choke resistor. the choke is the wirewound 390 ohm 5 watt. in other words, its the huge resistor in the bravo if anyone cares.

    this changed the overall tone of the amp WITHOUT changing the behavior and character of it. both the grey and black has some familiarities its just the black is somewhat clearer now.
    the new caps needs burning up and so im burning the amp 24 hours now while writing the review. its out of its cabinet and idling with a load box. dont worry of this process. the amp wont fail. as long as the chassis is out of the box for full aircon. the PT is not even that hot.

    i even have a workaround for having a bias adjusment mod on this amp but im not sharing it yet. basically, it ables you to use EH power tubes in the amp without redplate. i dont know why its always like this on EH tubes as i have no problems with sovteks or JJs. meaning, EH tubes takes more current bias that the other tubes and suggesting modding the amp for bias to cool down the circuit if using cheap EH tubes.

    tip: if the amp has 365dcv or more on the b+ then you know that your amp is alright. if ever you see the amp has 360dcv in the b+ like you would on EH tubes then you`ll see red plate. more B+ less bias. less b+ more bias. making it hot biased.
     
  5. RickyLee

    RickyLee Well-Known Member VIP Member

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    Thanks for that. The fella says he changed the choke resistor - but what did he change it to? Another resistor? Or did he install a choke? LOL

    I am thinking about installing a choke in mine. That would be about the simplest mod you could do to one of these amps. And I have been figuring it should have a standby switch of course.
     
  6. clutch71

    clutch71 Well-Known Member

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    Check out the article under Chapter 6 on the tech notes about Stand By switches.

    Personally I always thought the Bravo was kind of cool for not having a stanby switch. Most people think they are solid state when in fact they are not.

    Peavey.com :: Tech Notes
     
  7. RickyLee

    RickyLee Well-Known Member VIP Member

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    I sent you a P.M.
     
  8. john rich

    john rich New Member

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    Hi RickyLee,

    I have a Peavey Bravo 112 that needs a complete retubing (still has original tubes)

    Can you share how you re-worked the bias circuit to dual independent adjustable circuit?

    I too have a few mismatched EL84's I'll like to safely use with this amp.

    Cheers
     

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