VHT Special 6 Project

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Re: VHT Special 6 Project

Post by Slowy »

robthemac wrote: Tue Jan 18, 2022 6:04 am
Slowy wrote: Tue Jan 18, 2022 5:18 am Looking at those graphs, the first one, the 47nf looks like what my ears are hearing. What it doesn't represent is the intensity with which the sound cuts through a band mix. Normally, this is considered desirable but this amp proves it's possible to have too much of a good thing.

Actually, this might be the perfect amp for your Norlin era mud pie Lester. :think:
It's quite enthusiastic with a Tele, isn't it?

You mean ‘chainsaw’?
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Re: VHT Special 6 Project

Post by Jay »

Slowy wrote: Wed Jan 05, 2022 9:16 pm Gave it a Tung Sol 12AX7 and an old Philips 6V6. There's definitely some sweet spots to be found. Does a crystalline clean tone with a thumpy bottom and the fairly maxed out tone is still well defined but with a tweedy grit.

It's all upper mids and presence; insists it wants to be a gig amp so I'll give it a workout with the band tomorrow.
Do you know what the actual 6V6 there is in it now?

Below the plate dissipations of your amp with either a 6V6 selected or a 6V6GT. The plate dissipation on the 6V6 is way too high when using Robinette's calculators. Note, actual values used measured when amp was warm, in high power mode with no input signal.
Bias Calcs 6V6GT Capture.JPG
Bias Calcs 6V6GT Capture.JPG (276.32 KiB) Viewed 1102 times

Bias Calcs 6V6 Capture.JPG
Bias Calcs 6V6 Capture.JPG (161.96 KiB) Viewed 1102 times


Realised this morning tone pot is 1M so I will put a 1M resistor in parallel with it to bring it down to about 500KOhm.

VHT Special 6 schematic - modded.jpg
VHT Special 6 schematic - modded.jpg (218.05 KiB) Viewed 1102 times
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Re: VHT Special 6 Project

Post by H671 »

When I had my special 6 head, I had it modified by Alan at Anvil Amps according to the info in this Telecaster forum thread.
The mods enabled swapping a 6V6 to a 6L6. you also had to plug the speaker into a different Ohm output to compensate.
The link is quite a long read but full of useful info by those who have already done the research & mods.

https://www.tdpri.com/threads/vht-speci ... ad.207986/
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Re: VHT Special 6 Project

Post by Slowy »

H671 wrote: Tue Apr 19, 2022 4:19 pm When I had my special 6 head, I had it modified by Alan at Anvil Amps according to the info in this Telecaster forum thread.
The mods enabled swapping a 6V6 to a 6L6. you also had to plug the speaker into a different Ohm output to compensate.
The link is quite a long read but full of useful info by those who have already done the research & mods.

https://www.tdpri.com/threads/vht-speci ... ad.207986/
I have a 6L6 amp. What I'm wanting is a sweet 6V6 amp.
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Re: VHT Special 6 Project

Post by Slowy »

Jay wrote: Tue Apr 19, 2022 1:28 pm

Do you know what the actual 6V6 there is in it now?

The tone of your voice is making me nervous.

No, I have no idea what glass is in it now.
Beyond a critical point within a finite space, freedom diminishes as numbers increase. This is as true of humans as it is of gas molecules in a sealed flask. The human question is not how many can possibly survive within the system, but what kind of existence is possible for those who so survive.

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Re: VHT Special 6 Project

Post by Bg »

Slowy wrote: Tue Apr 19, 2022 4:41 pm
Jay wrote: Tue Apr 19, 2022 1:28 pm

Do you know what the actual 6V6 there is in it now?

The tone of your voice is making me nervous.

No, I have no idea what glass is in it now.
its shortly to be the exploding kind....
So, is that low alcohol or no alcohol at all? mmmm, no alcohol, do you want to try it? Noooooooooo.

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Re: VHT Special 6 Project

Post by Slowy »

Bg wrote: Tue Apr 19, 2022 4:44 pm
Slowy wrote: Tue Apr 19, 2022 4:41 pm
Jay wrote: Tue Apr 19, 2022 1:28 pm

Do you know what the actual 6V6 there is in it now?

The tone of your voice is making me nervous.

No, I have no idea what glass is in it now.
its shortly to be the exploding kind....
I'll ship it to Ukraine then.
Beyond a critical point within a finite space, freedom diminishes as numbers increase. This is as true of humans as it is of gas molecules in a sealed flask. The human question is not how many can possibly survive within the system, but what kind of existence is possible for those who so survive.

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Re: VHT Special 6 Project

Post by Bg »

Slowy wrote: Tue Apr 19, 2022 4:46 pm
Bg wrote: Tue Apr 19, 2022 4:44 pm
Slowy wrote: Tue Apr 19, 2022 4:41 pm

The tone of your voice is making me nervous.

No, I have no idea what glass is in it now.
its shortly to be the exploding kind....
I'll ship it to Ukraine then.
I'd rather you shipped it directly to Putin.
So, is that low alcohol or no alcohol at all? mmmm, no alcohol, do you want to try it? Noooooooooo.

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Re: VHT Special 6 Project

Post by Slowy »

Bg wrote: Tue Apr 19, 2022 4:50 pm
Slowy wrote: Tue Apr 19, 2022 4:46 pm
Bg wrote: Tue Apr 19, 2022 4:44 pm

its shortly to be the exploding kind....
I'll ship it to Ukraine then.
I'd rather you shipped it directly to Putin.
Done.
Beyond a critical point within a finite space, freedom diminishes as numbers increase. This is as true of humans as it is of gas molecules in a sealed flask. The human question is not how many can possibly survive within the system, but what kind of existence is possible for those who so survive.

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Re: VHT Special 6 Project

Post by Bg »

Slowy wrote: Tue Apr 19, 2022 4:59 pm
Bg wrote: Tue Apr 19, 2022 4:50 pm
Slowy wrote: Tue Apr 19, 2022 4:46 pm
I'll ship it to Ukraine then.
I'd rather you shipped it directly to Putin.
Done.
as long as you didn't put a return address on it, we should be safe down here in nz
So, is that low alcohol or no alcohol at all? mmmm, no alcohol, do you want to try it? Noooooooooo.

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Re: VHT Special 6 Project

Post by griff »

Eq pedal into the front end slowy. Drop anything between 2 and 6k

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Re: VHT Special 6 Project

Post by Jay »

Slowy wrote: Tue Apr 19, 2022 4:41 pm
Jay wrote: Tue Apr 19, 2022 1:28 pm

Do you know what the actual 6V6 there is in it now?

The tone of your voice is making me nervous.

No, I have no idea what glass is in it now.
The post I quoted from you suggests you have two 6V6 valves. One 6V6 and one 6V6GT. Which one do you have at home?

And yes I am concerned if it is the 6V6 in there now.
When faced with quality, I recognise it every time.

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Re: VHT Special 6 Project

Post by Bg »

Slowly, you gonna die bro...
So, is that low alcohol or no alcohol at all? mmmm, no alcohol, do you want to try it? Noooooooooo.

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Re: VHT Special 6 Project

Post by Jay »

Bg wrote: Tue Apr 19, 2022 6:51 pm Slowly, you gonna die bro...8
We are all gonna slowly die, but the wrong valve may speed it up :?
When faced with quality, I recognise it every time.

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Re: VHT Special 6 Project

Post by Bg »

"Bruce Slowly, you gonna die bro"
So, is that low alcohol or no alcohol at all? mmmm, no alcohol, do you want to try it? Noooooooooo.

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