How to Transport a Tube Amp Safely
To transport a tube amp safely, let it cool down before you move it, keep it upright and secured so it cannot slide or fall, and protect it with a padded cover or case. After a cold trip, give it time to reach room temperature before you switch it on. For shipping, pack it with plenty of padding and treat the tubes with extra care.
Let the amp cool down first
Hot tubes are more fragile than cold ones. The filaments and internal parts are at their most sensitive when they are glowing, so a knock just after a gig is the worst moment. Switch the amp off, give it ten minutes or so to cool, and only then pack it up. Use that time to coil your cables and pack your pedals.
It also protects your hands: power tubes get hot enough to burn you, and the grille or back panel near them can be warm for a while.
Protect the amp in transit
Most damage on the road is cosmetic: scuffed tolex, dented corners, torn grille cloth. A padded cover takes care of most of that, and it is much lighter than a flight case. Kool's Head Cover is a heavy-duty cover with rugged cloth and a protective padded layer, made in the EU, and it fits Kool heads such as the Ace, 1984 and Blue Sky. There is also a Combo Cover for the combos and an XOsn112 Cover for the Kool 1x12 cabinets.
A cover protects against knocks and scratches, not against heavy impact. If your amp travels in a van with a lot of other gear, goes on a plane or gets handled by others, a flight case is the safer option.
A few more habits help:
- Carry the amp by its handle and keep it upright, the way it normally stands.
- Do not stack heavy gear on top of the amp, even with a cover on.
- Unplug and pack the footswitch and speaker cable separately so the jacks are not stressed.
- Keep the back of the amp, where the tubes usually sit, away from hard edges and other gear.
In the car
Put the amp on a flat surface, upright, and wedge it in with soft bags or a blanket so it cannot slide or tip over when you brake. The floor of the boot or the back seat footwell is better than on top of other gear. A combo is heavier at the speaker end, so make sure it cannot fall forward onto its front.
Weight is worth thinking about too. The Kool Ace 18 watt head weighs about 11.5 kg and the Marvell head about 16 kg, so a head with a separate cabinet is often easier to carry than one heavy combo. If you are still choosing, amp head vs combo compares the two.
Do not leave the amp in a parked car on a hot day or a freezing night. Big temperature swings are not good for electronics, speakers or wood.
Cold, damp and condensation
When you bring a cold amp into a warm room, moisture can condense on and inside it, just like on a cold bottle. Switching on while there is condensation is a bad idea with the high voltages in a tube amp. Leave the amp to come up to room temperature first. After a cold drive in winter, give it at least half an hour, and longer if it was very cold. Keep it out of the rain, and if it does get wet, do not switch it on until it has been checked.
Shipping a tube amp
Shipping is rougher than carrying it yourself. Use a strong box with at least several centimetres of firm padding on all sides, so the amp cannot move inside the box. Many technicians recommend removing the power tubes for courier shipping and packing them separately in their own padded boxes, labelled with their position, because a heavy tube can break or loosen its socket if the parcel is dropped. Only do this if the tubes can be reached without opening the chassis, and with the amp unplugged and cold. Anything that involves taking the chassis out: leave that to a qualified technician: there are high voltages inside, even when the amp is switched off and unplugged.
If you remove the power tubes, put the same tubes back in the same positions. If a tube breaks in transit, replace the pair with a matched set; a spare set with the same specs saves you a rebias, as explained in tube amp biasing explained.
A quick check before you play
- Look over the tubes for anything loose, cracked or with a white milky patch inside the glass (a sign the vacuum is gone).
- Connect the speaker cabinet before you switch on. A tube amp should never run without a speaker load.
- Check the impedance setting matches your cabinet.
- Switch on and listen for unusual noise before you turn up.
The tube amp maintenance checklist covers more of these routine checks.
Next step
If you take your Kool head to rehearsals and gigs, the Head Cover is the simplest way to keep it looking good. For a combo, choose the Combo Cover. Not sure which cover fits your amp or cabinet? Ask Kool.