Home »Forum»Recording and mixing»Marshall head as preamp?

Marshall head as preamp?

posted on #1
User Avatar Member
Posts: 11
Joined: 17.05.14
I have a Marshall JCM800 200W valve head but no speakers for it.

If I wanted to use it as a preamp, can I use it without speakers connected and just connect the headphones to line in/mic?
posted on #2
User Avatar
Founder
Posts: 2552
Joined: 30.12.10
hey wolffy!

I suppose you are not going to plug the headphons INTO the line IN right??? that would let your amp try to use em as a microphone, which will not work...

If the top has a line OUT, than thats still not fit to serve a headphone, you would need a headphone preamp between the amp lineout and your headphones in that case.

Running the valve without any speakers attached is something I would not risk, the amp will have a lot of watts on the outputs meant for the speakers, and thats a serious risk for catching an electric stroke just by touching the empty plugs. If it has a switch to turn off the speaker cabinet, then thats fine, if it keeps the output "on fire", I wouldnt do it.
I'm no electrician btw, just telling you what I'd do :)
posted on #3
User Avatar Member
Posts: 48
Joined: 25.01.14
Hey Wolffy:)
Dicks right!, you cant risk using the Marshall head like that. I've got a TSL100 JCM2000 and its got a XLR DI type option to go into my mixing desk, but I must always hook this up to a 4x12 cab because of the "lode". You'll fry everthing and probably damage all your gear( and theres a risk to life).And the cab must be compatible with that kind of head.

Hope this helps!
Pico:)
posted on #4
User Avatar
Founder
Posts: 2552
Joined: 30.12.10
+1 never under-estimate the electricity supplied by a good amp... dont get fried brothers!
(glad i noticed wolffy online today, so I guess he survived the experiemental phase)
posted on #5
User Avatar Member
Posts: 1
Joined: 11.01.14
Amp always need to have speaker load on them, or plug amp into a dummy load, like a ada monster cab, palmer or something similar.

Your amp might have efx loop out, or a line out, but still needs some type of load connected.


M
posted on #6
User Avatar Member
Posts: 11
Joined: 17.05.14
Thanks for all the replies - yeah, I borrowed a Marshall 4x12 stack and am using that for load. I found the DI, but I've got noisy volume pots, so I'm going to have to get some work done on it before I can use it to record. Ah well! :(
posted on #7
User Avatar Member
Posts: 48
Joined: 25.01.14
If you want to record your guitar parts on a Marshall or other amp that has a 50/100watt head into your mixing desk or interface!. This is what you need to do( basically we all know that these amps sound their best when CrankedUp to the max!:D)....So>
>firstly you need to buy/use a THD type hotplate 8ohm/16ohm(check your speaker cab 1st to match these ohm's ok!(there are other Hotplate types/makes on the market so look around)Basically you hook your head up to the hotplate and then run a line into your speaker cab.....what happens is you can put your amp head volume on high but adjust the power soak/brake volume on your hotplate( this becomes your Master Volume)......so you get nice tube sound but at bedroom/studio levels....Hughes & Kettner have this built into their tube-meister amps(redbox). I've got the 36 watt, and you can switch it down to 18 watt>5watt>1watt>"0"(zero)watt. In silent mode with Zero watt(power soak).... I still must be hooked up to a cab!, but with this feature I can get nice saturated sounds without annoying anyone...and plug straight into my interface>computer>mixer.
You'll find links on Youtube showing you the THD hotplate in action, and check out the Hughes&Kettner Tubemeister36 demo at the Musikmesse( With Rob Marchello)....I just put this info up because of Wolffy's question regarding this option!....don't want any of you people to get hurt/fried by using these type of Amps in the wrong way!:)
Edited by incivanpico on August 31 2014 19:59
posted on #8
User Avatar Member
Posts: 11
Joined: 17.05.14
Thanks incivanpico. I didn't even know these devices existed so I'll have a look at them.
posted on #9
User Avatar Member
Posts: 4
Joined: 22.02.21
Yup, attenuator with a line out. I do it all the time. Run the speaker out from your amp to the speaker in on the attenuator. Run the line out from the attenuator into your interface and load a speaker impulse response in your DAW. I use two-notes wall of sound for that. I have a lot of vintage tube amps in my stash to pick from, it's fun.

[img]https://i.imgur.com/AbF1mRw.jpg[/img]

[img]https://i.imgur.com/TGKpP4B.jpg[/img]

[img]https://i.imgur.com/eAf3r36.jpg[/img]
Edited by Riffraff on March 30 2021 02:24
wikiloops online jamsessions are brought to you with friendly support by:
GibsonAxe from United States

"This place is such an awesome place to meet folks and jam with them on some amazing creations! Before this, it was mostly all about finding a backing track to jam with, but this is so much more personal!! Awesome site and just love the potential here"

wikiloops uses Cookies and processes data in compliance with the GDPR,
as stated in our data privacy policy ..