I had a spare Isoblok I wasn't using, so I removed the built in plug and put in an IEC jack.
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Show posts MenuQuote from: mccutter on January 14, 2024, 05:40:53 AMThank you phatt, Only have to find a old bulb and not led !
And thank you g1 , I let you know the progress !
Quote from: Lobsterjoe on January 10, 2024, 02:47:17 PMJust got an '06 Trademark 60. At power-on, there are continuous popping and whooshing noises. Consistently, it goes away after about six minutes.
Power cycle and the noise returns but then lasts less than a minute; unless the amp's been powered for an hour or more-then it's fine after restart.
All other functions work and amp sound normal except for addition of noise.
If I plug guitar into the effects return, the noise stops and guitar sound is fine.
Cleaned all the jacks, visually inspected PC board, jumpered the FX loop jacks (no effect on noise).
Channels settings, boost level and reverb level don't affect the noise level, but master EQ does. The character of the noise doesn't change-just how loud it is proportionate to the EQ cut or boost.
Tech 21 was responsive to my inquiry and said they haven't seen this before. Suggested I send it in. Being in California, the round trip shipping even for chassis only will be almost as much as the bench charge. Reminder: other than switches and some caps/IC's, most of the components are SMT. Comments welcome.
Quote from: Maddus on January 12, 2024, 04:22:45 AMOk, thanks. Would I also hear that oscillations if they happen?
I hear some background fuzz underlying the notes.
Quote from: WimWalther on November 03, 2023, 11:30:08 PMHi folks,
Is there any point in changing out the 4558s in a (first model, mid-1983) Peavey KB 300?
Is there much of anything to be gained by this? The amp works fine, though it's maybe a bit noisier than I'd wish.
Thanks!
Quote from: saturated on November 02, 2023, 07:29:17 PMall i know or think is zener diodes are kind of like backwards diodes...idk
Quote from: WimWalther on October 28, 2023, 01:15:24 AMHowdy,
I just picked up a KB 300 for a song. The unit is really nice, but the controls are dirty and the cord jacket is cracked just outside of the Heyco grommet. ETA: Cord is fixed.. Had to cut off 1" and re-set the cord in the grommet.
So the chassis needs to come out but I'm not having much luck. I found 4 screws on top (chrome strips) and 4 more in the back that secure the chassis to the case. Also unplugged the speakers & reverb tank.
The chassis can be shifted a bit, but won't slide out the rear.. what am I missing? More screws somewhere? ETA: Got it. Was hanging up on the edge of the chassis.
Also.. this is the early version (no XLR input), built in mid-1983. It doesn't have the pair of 5W resistors on the back of the tweeter horn. Should these be added, for safety? Do you know the correct value(s)?
Thanks!
Quote from: saturated on October 10, 2023, 11:49:46 PMI am really enjoying this set up
very much so
but apparently this Crate Amp was neglected and not played enough and in need of some love
because this slide switch has been cutting in and out and off and on...but getting better with some exercise
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Quote from: FleshOnGear on September 23, 2023, 05:47:05 PMThe are some big positives for this amp. The cabinet is sturdy. Even stock the clipping circuit is sufficiently tube-like in tone. And, these are relatively cheap on the used market. Just a few tweaks and I got a great, dynamic metal tone.
Quote from: GeezerB on August 31, 2023, 12:46:52 PMJust bought a loupe... great tip thank you. I also believe I may have solved my issue! I reflowed all the joints on amp board just in case... and the transistors that were held on by screws I removed and cleaned up the connections. And cleaned the hell out of the "Mute" switch... could not play too loud last night due to sleeping house but did not hear any popping and sounded good... so I believe my problems were the bad power amp connections combined with the Zener diode in the preamp. Thanks to the forum... what a feeling.
Quote from: GeezerB on August 23, 2023, 10:28:32 PMI input a nice clean 1k sine wave, and here is the result from both the preamp out and from the power amp out... both appear to be wonky.
I guess this tells me at least that the distortion is starting in the preamp section at least? But it still seems that the power amp should be louder.
I guess I also need to understand the function of Gain and Master...Gain is there for crunch, but doesnt control volume?
First time using this scope, it is really cool to use such a powerful tool for diagnosis, cant wait to use to greater potential and understanding.
Quote from: Tassieviking on August 04, 2023, 10:34:15 PMAccording to the SUNN BETA service manual:
The Sunn Beta has 1.75v P-P out at the master line output, but each individual channel has only 1.1v P-P at the preamp line output.
Sunn Beta basically has 3 effect loops.
If you made a single channel the output to the power amp is only 1.1v P-P which should be ok, and you don't have to crank the volume pot all the way around.
If anything you might not get enough signal to drive the TPA chip to full power since the Beta figures are peak to peak.